Scurvy (vitamin C deficiency)

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Definition and overview

Scurvy is the multisystem disease caused by severe deficiency of vitamin C (ascorbic acid), an essential water-soluble vitamin that humans cannot synthesise endogenously. The biochemical pivot is collagen: vitamin C is an obligatory cofactor for prolyl hydroxylase and lysyl hydroxylase, the enzymes that hydroxylate proline and lysine residues during the post-translational maturation of the collagen alpha-chain. Without hydroxylation, the collagen triple helix cannot stabilise at body temperature, so the molecule is mis-folded, secreted in defective form, and rapidly degraded. The downstream clinical signature is therefore connective-tissue failure: capillary walls weaken and bleed, wounds fail to heal, dentin and bone become defective, and hairs twist and fragment within their follicles.[1][3]

The disease is ancient — it crippled the long sea voyages of the Age of Sail and was the leading cause of death in sailors until James Lind's 1747 trial proved citrus could prevent it — yet it is emphatically not extinct.[3] Modern scurvy is concentrated in at-risk subgroups: isolated elderly people subsisting on a "tea-and-toast" diet, patients with alcohol use disorder, people with anorexia nervosa or autism-spectrum selective eating, those with malabsorption, dialysis-dependent patients, refugees and food-insecure populations, and post-bariatric patients. A 2024 national United States inpatient analysis documented a more than three-fold rise in paediatric scurvy between 2016 and 2020.[2]

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Classification

There is no formal WHO or consensus severity grading for scurvy, but examiners expect you to classify it along three axes: [1]

Epidemiology and risk factors

Scurvy develops only when dietary vitamin C is essentially absent for approximately 1 to 3 months — body stores are around 1500 mg, and clinical deficiency appears once stores fall below about 300 mg. Because vitamin C is concentrated in fresh fruit and vegetables, scurvy is a disease of monotonous, processed, fruit- and vegetable-free diets, not of total starvation per se. [1]

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The 2024 JAAOS Global national analysis of nearly 19.5 million paediatric inpatient records showed the incidence more than tripled over five years, with affected children more likely to be young, male, obese, in the lowest income quartile, and to carry a concurrent diagnosis of autism spectrum disorder — 64.2% in this cohort.[2] Adults follow a different epidemiology: classical stems in exams centre on the isolated elderly patient with a tea-and-toast diet, the chronic alcoholic, the young woman with restrictive anorexia nervosa, and the long-term haemodialysis patient.[5]

Pathophysiology

The mechanism is one of the most examinable in nutrition dermatology because it ties biochemistry directly to a visible phenotype. L-ascorbic acid maintains iron in the ferrous (Fe2+) state required by the active site of prolyl-4-hydroxylase and lysyl hydroxylase, the endoplasmic-reticulum enzymes that add hydroxyl groups to specific proline and lysine residues of the collagen pre-pro-alpha chain. Hydroxylation of proline stabilises the triple helix (each chain needs roughly 100 hydroxyproline residues to remain intact at 37°C), while hydroxylation of lysine permits the inter- and intra-molecular cross-linking that gives tensile strength to mature collagen fibrils. When vitamin C is absent, hydroxylation fails, the triple helix denatures at body temperature, and the mis-folded chains are degraded intracellularly rather than secreted. The tissue-level consequences are widespread: [1]

• Capillary fragility — weakened endothelial basement membrane and perivascular collagen leads to perifollicular petechiae, ecchymoses, and bleeding gums; coagulation factors and platelets are normal, so the bleeding is mechanical, not haematological.
• Poor wound healing — type I and type III collagen cannot be remodelled; chronic ulcers granulate poorly, and previously healed wounds may reopen.
• Defective dentin and bone — in children, osteoid and dentin formation fail, producing sub-periosteal haemorrhage, the radiographic Frankel white line, and loose teeth.
• Corkscrew hairs — defective disulfide cross-linking in cortical keratin causes the hair shaft to twist, coil, and fragment within a keratin-plugged follicle; this is the pathognomonic cutaneous sign.
• Non-collagen roles — ascorbate is also a cofactor for dopamine β-hydroxylase (catecholamine synthesis — explaining the early fatigue and lassitude), for carnitine synthesis (contributing to myalgia and weakness), and it enhances dietary iron absorption (reducing ferric to ferrous iron) and preserves folate in its active form — both relevant to the anaemia of scurvy. [1]

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Kinetics of deficiency and why symptoms take months to appear

The clinical latency of scurvy is fixed by the size of the body ascorbate pool and its turnover. A replete adult carries roughly 1500 mg of ascorbate, distributed between plasma, leukocytes (the highest intracellular concentration), and tissues. Daily turnover is 40 to 60 mg per day in a healthy non-smoker and 20 to 30 mg higher in a smoker, in pregnancy, or during acute illness. At zero intake, the pool declines linearly; clinical signs appear when stores fall below 300 mg (about 20 percent of the replete pool), which corresponds to 8 to 12 weeks of total dietary absence. This kinetics explains why scurvy is the disease of months of a monotone diet rather than of brief dietary disturbance, why historically it broke out on long sea voyages only after the ship's citrus ran out, and why modern scurvy clusters in patients whose diet has been rigidly narrow for many months — the autistic selective eater, the tea-and-toast widower, and the anorexic young woman. It also explains the speed of recovery: a single 500 mg dose of ascorbic acid repletes roughly a third of the deficit, prolyl and lysyl hydroxylase activity resumes within hours, and new, properly hydroxylated collagen is secreted within a day. [1]

Why the bleeding is non-coagulopathic

A favourite viva question is why does the scurvy patient bleed despite normal clotting? The answer is structural, not biochemical. Platelet number, platelet function, the coagulation cascade, and von Willebrand factor are all intact in scurvy. What fails is the vascular wall: capillary basement membrane and the perivascular collagen sheath are type IV and type I/III collagen respectively, and both depend on ascorbate for hydroxylation. Without it, the vessel wall is mechanically weak, so trivial shearing forces — gravity in the legs, the brush of a toothbrush, the pull of a hair follicle — allow red cells to extravasate. The bleeding time may be modestly prolonged because the damaged vessel cannot constrict and seal effectively, but the prothrombin time, activated partial thromboplastin time, and platelet count are normal, which is the single most useful bedside discriminator from a true coagulopathy. This is also why scurvy will bleed through anticoagulation rather than because of it — a warfarinised patient with scurvy bleeds from both mechanisms simultaneously. [1]

Clinical presentation

Scurvy is one of the great clinical mimics: it can present as a bleeding disorder, an inflammatory arthritis, a limp in a child, or a non-healing ulcer. Examiners deliberately test atypical presentations, so learn the full phenotype, not just the textbook tetrad. [1]

Cutaneous features (the hallmark)

The cutaneous tetrad is follicular hyperkeratosis, corkscrew hairs, perifollicular purpura, and ecchymoses. Follicular hyperkeratosis produces a rough, sandpaper skin texture over the upper arms, thighs, and buttocks; each hyperkeratotic follicle contains a twisted, coiled, fragmented corkscrew hair — the pathognomonic sign. Around each affected follicle, a ring of petechial haemorrhage appears (perifollicular purpura), most densely on the shins, dorsal feet, and other dependent areas because gravity drives red-cell extravasation through fragile capillary walls. With more advanced disease, larger ecchymoses appear on the limbs from minor trauma, and existing wounds fail to heal or reopen.[1]

Oral features

The gums become purple, swollen, spongy, and bleed on the slightest touch. Gingival hypertrophy is most pronounced between the teeth, and in advanced disease the periodontal ligament fails and teeth become loose. Mucosal petechiae may appear on the palate and buccal mucosa. A critical examiner point: gum changes require teeth — the edentulous patient does not develop the classic gingival picture, which can delay diagnosis in elderly edentulous patients.[3]

Systemic features

Musculoskeletal manifestations dominate in children and are often the presenting complaint: arthralgia, joint effusions, haemarthrosis, lower-limb pain, and refusal to walk. In infants and young children, sub-periosteal haemorrhage (especially around the knee and distal femur) produces exquisite tenderness and a pseudoparalysis — Moeller-Barlow disease. Systemic symptoms include fatigue, malaise, irritability, depression, dyspnoea, and oedema (from vascular fragility and hypoalbuminaemia). Anaemia is common and may be normocytic (chronic disease), microcytic (coexisting iron deficiency), or macrocytic (folate deficiency), because vitamin C enhances iron absorption and preserves folate. [1]

Natural history and order of appearance

Scurvy evolves in a predictable sequence that examiners reward knowing. Early, non-specific symptoms — fatigue, malaise, anorexia, irritability, and low mood — appear first, reflecting impaired catecholamine synthesis (dopamine β-hydroxylase requires ascorbate) and early carnitine deficiency. These are easily attributed to the underlying illness (alcoholism, anorexia, isolation) and are missed. Over the following weeks, follicular hyperkeratosis appears on the extensor limbs, followed by corkscrew hairs within those plugged follicles, and then perifollicular purpura as capillary fragility declares itself. Gingival swelling and bleeding typically follow, and finally the more dramatic manifestations — ecchymoses, haemarthrosis, refusal to walk (children), reopening of old wounds, and anaemia — appear in advanced disease. The lesson for the clinician is that scurvy is symptomatic for weeks before it is haemorrhagic: the alert examiner will pick the corkscrew hair and the perifollicular purpura at the bedside long before the patient develops the bruising that triggers a coagulopathy workup. [1]

Comorbidities and co-deficiencies

Scurvy almost never occurs in isolation. The same dietary pattern that produces vitamin C deficiency usually produces thiamine deficiency (Wernicke risk), folate and B12 deficiency (megaloblastic anaemia), iron deficiency (microcytic anaemia), zinc deficiency (acrodermatitis enteropathica pattern), vitamin D deficiency, and protein-energy malnutrition. Alcohol use disorder, anorexia nervosa, malabsorption, and dialysis each carry their own cluster of co-deficiencies. A practical rule is: when you find scurvy, screen for the others — send thiamine (and give empirically before refeeding), folate, B12, iron studies, zinc, vitamin D, and a basic nutritional panel, and arrange dietetic and (where relevant) psychiatric or addiction input. Treating ascorbate alone corrects the collagen defect but leaves the patient exposed to Wernicke, refeeding syndrome, macrocytic anaemia, and osteomalacia. [1]

Atypical presentations examiners test

Differential diagnosis

The differential is wide because purpura, limp, and poor wound healing each generate their own lists. The discriminator is the distribution (perifollicular, dependent lower limbs), the corkscrew hair, the dietary history, and a normal coagulation and platelet screen. [1]

Clinical and bedside assessment

The diagnosis is essentially clinical and is made at the bedside by combining the dietary history with the characteristic morphology. A focused examination covers skin, gums, joints, and a screen for underlying cause. [1]

The bleeding time may be modestly prolonged (capillary fragility) but the PT, APTT, and platelet count are normal — this combination is the single most useful bedside discriminator from a coagulopathy. [1]

Investigations

Scurvy is a clinical diagnosis confirmed by therapeutic response. Laboratory confirmation is supportive and is not always necessary, but a small panel excludes mimics and quantifies co-deficiencies.[3]

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Diagnostic approach and interpretation

In practice the diagnostic sequence is: suspect on clinical grounds (diet + tetrad), exclude mimics with a small panel, confirm by response, and screen for co-deficiencies. The plasma ascorbic acid assay is the formal confirmatory test but is not available in many hospitals, turns around slowly, and is easily artifactually low if the sample is mishandled — ascorbate oxidises on exposure to light and warm temperatures, so the tube must be wrapped in foil, placed on ice, and separated within an hour. For these reasons, the therapeutic response is the pragmatic gold standard: a single 1000 mg dose of oral ascorbic acid that produces resolution of bleeding, gum swelling, and fatigue within 24 to 48 hours is itself diagnostic and curative, and no candidate should delay treatment while awaiting a confirmatory level in a classical case. The platelet count and coagulation screen are the most important exclusionary tests — a low platelet count, prolonged PT, or prolonged APTT redirects the differential away from scurvy and towards thrombocytopenia, vitamin K deficiency, warfarin excess, liver disease, or disseminated intravascular coagulation. In the limping child, knee and distal-femur radiographs showing the Frankel white line, Wimberger sign, Pelkan spurs, and sub-periosteal elevation are the radiographic discriminator from septic arthritis, osteomyelitis, and malignancy, and the dietary history is the historical one.[4]

Skin biopsy is reserved for the diagnostically uncertain adult case — typically when the differential includes leukocytoclastic vasculitis or a pigmented purpuric dermatosis. The histological picture is perifollicular haemorrhage with dilated, keratin-plugged follicles and twisted hair shafts, and crucially, no leucocytoclasia and no vessel-wall fibrinoid necrosis — this single distinction separates scurvy from small-vessel vasculitis, which otherwise presents with a similar dependent purpuric phenotype. Direct immunofluorescence is negative (no IgA deposition), excluding IgA vasculitis (Henoch-Schönlein purpura). [1]

Management — resuscitation

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Scurvy is rarely a time-critical emergency, but several scenarios demand prompt action: severe bleeding or symptomatic anaemia, paediatric refusal to bear weight (which can be the presenting emergency), haemodynamic compromise, and any patient in whom the diagnosis has been missed for months. The immediate bundle is: [1]

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Management — definitive and stepwise

Definitive therapy is ascorbic acid replacement, dietary correction, and treatment of co-deficiencies and the underlying cause. The regimen is straightforward and the response dramatic. [1]

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Dietary correction is the long-term answer and the preventive message. High-vitamin-C foods include citrus (oranges, lemons, limes), red and green peppers, kiwifruit, strawberries, broccoli, Brussels sprouts, tomatoes, and potatoes (especially with skin). As little as 10 mg per day of vitamin C prevents scurvy, so a single orange (~70 mg) more than suffices; the recommended daily allowance is set higher for optimal function (see Special populations). [1]

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Prevention

Scurvy is one of the most easily prevented diseases in medicine — a single daily portion of fruit or vegetables is sufficient. The preventive framework has three layers: adequate dietary intake matched to the regional recommended daily allowance, targeted supplementation in groups with increased requirement or impaired absorption, and anticipatory nutritional counselling of high-risk patients (autistic children with selective eating, the socially isolated elderly, patients on long-term dialysis, and those after bariatric surgery).[3] A focused dietary history at routine encounters — particularly in general practice, paediatric developmental reviews, and pre-dialysis clinics — is the highest-yield preventive intervention, because clinical scurvy is the end-stage of months of a deficient diet during which the patient is asymptomatic but repletable.

As little as 10 mg of vitamin C per day prevents scurvy, so almost any diet containing fresh produce is protective; the recommended daily allowances are set higher (40 to 90 mg) to maintain tissue saturation. Smokers need an additional 35 mg per day because oxidative stress increases ascorbate turnover, pregnancy and lactation raise requirements to 50 to 70 mg per day, and dialysis patients should receive routine water-soluble vitamin supplementation (100 to 200 mg daily, avoiding megadose long-term because of oxalate). Public-health measures that improve access to fresh fruit and vegetables — food subsidies, school fruit schemes, and fortified infant formulas — have historically eliminated scurvy at population scale and remain the structural answer in food-insecure settings. [1]

Specific subtypes and scenarios

Paediatric scurvy (Moeller-Barlow disease)

Paediatric scurvy is the rising phenotype in modern series and the one most often missed. The 2024 JAAOS Global analysis found that 64.2% of inpatient paediatric scurvy cases had a concurrent autism spectrum disorder diagnosis, and that incidence tripled from 2016 to 2020.[2] The typical child is 2 to 8 years old, on a highly selective diet (often only a few carbohydrate foods), and presents with limp, refusal to walk, or irritability on handling rather than the textbook cutaneous tetrad. Inflammatory markers may be elevated, prompting extensive workup for septic arthritis, osteomyelitis, leukaemia, or JIA. The radiographic tetrad of Moeller-Barlow disease is the discriminator: Frankel white line, Wimberger sign, Pelkan spurs, and Trümmerfeld zone, with sub-periosteal haemorrhage around the knees.[4] Treatment is oral ascorbic acid 100 to 300 mg daily with rapid clinical improvement.

Scurvy and anorexia nervosa

Scurvy is increasingly recognised in restrictive eating disorders. The 2024 Frontiers in Nutrition review of nine co-occurrence cases highlighted that gastrointestinal, psychiatric, and dermatological symptoms overlap and that diagnosis is often delayed because scurvy is presumed extinct; vitamin C supplementation produces rapid improvement, but the malnutrition of anorexia requires a multidisciplinary, refeeding-safe approach.[5] Always give thiamine before refeeding and monitor phosphate, magnesium, and potassium.

Dialysis-associated scurvy

Vitamin C is water-soluble and is lost across the dialyser. Long-term haemodialysis patients are at risk, especially if dietary intake is also poor. Routine supplementation with 100 to 200 mg daily prevents deficiency; higher doses are avoided because vitamin C metabolism generates oxalate, and secondary oxalosis can complicate chronic high-dose supplementation in end-stage renal disease. [1]

Post-bariatric, malabsorptive, and food-insecure scurvy

Gastric bypass and short-bowel syndromes impair absorption of water-soluble as well as fat-soluble vitamins. Refugees, food-insecure households, and socially isolated elderly patients present with the classical phenotype and respond rapidly to oral replacement; the long-term fix is dietary and social. [1]

Complications and pitfalls

The complications of scurvy are the consequences of untreated collagen failure: severe haemorrhage (gastrointestinal, intramuscular, intracranial — rare but described), poor wound healing, reopening of old surgical or traumatic wounds, immunosuppression with increased infection susceptibility, anaemia, and — in advanced paediatric disease — pulmonary hypertension and death.[1]

The classic pitfalls are diagnostic: [1]

Prognosis and disposition

Treated scurvy has an excellent prognosis: bleeding stops within 24 to 48 hours, gums heal within 1 to 2 weeks, anaemia resolves within a month with iron and folate, and hairs normalise over 1 to 3 months as new shafts grow out. Full recovery is the rule. Untreated scurvy was historically fatal — death from haemorrhage, infection, or cardiac failure — and modern mortality is rare but described in neglected cases, particularly children with pulmonary hypertension.[1][2]

Disposition is usually outpatient with dietetics, social support, and follow-up of co-deficiencies. Admit patients with severe anaemia, haemodynamic instability, refusal to bear weight (paediatric), suspected pulmonary hypertension, unsafe social circumstances, or significant comorbidity (advanced anorexia, decompensated liver disease). [1]

Special populations

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Evidence, guidelines and regional differences

The evidence base is dominated by case series, narrative reviews, and one national inpatient analysis rather than randomised trials — appropriate, since the diagnosis and the cure have been settled for 250 years. The landmark modern papers are: [1]

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Controversies

• Optimal replacement dose — published regimens range from 100 mg to 1000 mg daily; modern consensus favours 300 to 1000 mg daily for one week then 100 mg daily maintenance, but the dose-response and minimum effective dose are not well studied.
• Oral vs IV — IV is reserved for malabsorption or nil-by-mouth; oral is universally effective when absorption is intact.
• High-dose vitamin C in critical illness and sepsis — CITRIS-ALI and LOVIT trials did not show consistent mortality benefit; high-dose IV ascorbate is not standard care outside trial protocols.
• Oxalate nephrolithiasis risk — long-term high-dose supplementation (over 2000 mg/day) increases urinary oxalate; caution in renal stone formers and dialysis patients. [1]

Exam pearls

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Red flags

Exam application bank (NEET-PG / INICET)

One-line answer

Scurvy is caused by deficiency of vitamin C (ascorbic acid), an essential cofactor for collagen synthesis (hydroxylation of proline and lysine residues). Clinical features: follicular hyperkeratosis, corkscrew hairs, perifollicular purpura/petechiae (capillary fragility from defective collagen), bleeding and hypertrophied gums, poor wound healing, arthralgia, and anaemia. Risk factors: tea-and-toast diet in the elderly, alcoholism, anorexia nervosa, autism with selective eating, malabsorption, dialysis, smoking, and food insecurity. Treatment: oral ascorbic acid 300 to 1000 mg daily for one week, then 100 mg daily maintenance — symptoms resolve within 24 to 48 hours. [1]

Worked stems (answer without another resource)

Stem 1 — Classic presentation. Map symptoms to mechanism; name the first investigation and first treatment step with dose/route if drug therapy is standard. [1]

Stem 2 — Unstable / complicated. List red flags that force immediate resuscitation, theatre, ICU, antidote, or reperfusion — and what you do in the first 15 minutes. [1]

Stem 3 — Atypical group. Elderly, pregnancy, child, or immunocompromised: how presentation and thresholds change. [1]

Stem 4 — Differential trap. Name the three closest mimics and one discriminator for each. [1]

Stem 5 — Disposition. Who goes home with safety-netting, who is admitted, who needs HDU/ICU/theatre, and what follow-up is mandatory. [1]

Rapid viva checklist

1. Definition + classification
2. Pathophysiology chain
3. Bedside signs / criteria
4. Score with exact components (if any)
5. Emergency bundle
6. Definitive therapy with doses
7. Complications of disease and of treatment
8. Special populations
9. Guideline/trial name if classic
10. Three exam traps

Coverage self-check

If you cannot answer any stem above from this page alone, re-read the matching section — the page is intended to be self-sufficient for final-prof and NEET-PG/INICET questions on Scurvy (vitamin C deficiency).

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Quick self-test: a 70-year-old man with corkscrew hairs, perifollicular purpura on the shins, bleeding gums, and a history of living on tea and toast since his wife died. PT 12 s, APTT 31 s, platelets 220. What is the diagnosis, the confirmatory test, and the treatment?

Diagnosis: scurvy (vitamin C deficiency). Confirmatory: plasma ascorbic acid under 11.4 micromol/L, OR the clinical response to ascorbate. Treatment: oral ascorbic acid 300 to 1000 mg daily for one week, then 100 mg daily maintenance, plus dietetic referral and social support. PT and APTT are normal — bleeding is from capillary fragility, not coagulopathy.

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References

1. [1]Toscano F, Zirilli G, Foti Randazzese S, et al. Scurvy, all the faces you can see: our experience and review of the literature Ital J Pediatr, 2025.PMID 40437614
2. [2]Reikersdorfer KN, Singh A, Young JD, et al. The Troubling Rise of Scurvy: A Review and National Analysis of Incidence, Associated Risk Factors, and Clinical Manifestations J Am Acad Orthop Surg Glob Res Rev, 2024.PMID 39018570
3. [3]Kinlin LM, Weinstein M. Scurvy: old disease, new lessons Paediatr Int Child Health, 2023.PMID 37795755
4. [4]Trapani S, Rubino C, Indolfi G, Lionetti P. A Narrative Review on Pediatric Scurvy: The Last Twenty Years Nutrients, 2022.PMID 35277043
5. [5]Cui S. A comprehensive review on the co-occurrence of scurvy and anorexia nervosa Front Nutr, 2024.PMID 39296506