Vitamin C Deficiency and Scurvy: Causes, Symptoms, and Prevention
Key takeaways
- Scurvy is caused by a long lack of vitamin C, usually many weeks or months without fresh fruit or vegetables.
- People with restricted diets, food insecurity, or certain mental health conditions face higher risk[1].
- Signs include bleeding gums, easy bruising, joint pain, and slow wound healing.
- Vitamin C from food or supplements usually reverses symptoms within days to weeks.
What is scurvy?
Scurvy is a disease caused by a severe, long-term lack of vitamin C in the diet.
Vitamin C, also called ascorbic acid, is needed to build collagen.
Collagen holds together skin, blood vessels, gums, and bone.
Without enough vitamin C, these tissues weaken and break down.
Scurvy was once common among sailors who had no access to fresh produce for months at sea.
It still happens today, though it is rare in wealthy countries.
Why does the body need vitamin C?
Vitamin C is an antioxidant.
It protects cells from damage caused by unstable molecules called free radicals.
It also helps the body absorb iron from plant foods.
It supports the immune system.
The body cannot make vitamin C on its own.
It also cannot store much of it.
This means people need a steady supply from food or supplements.
Stores can run low within about a month of very low intake.
Who is at risk of scurvy?
Anyone who eats little to no fruit or vegetables for an extended time can develop scurvy.
- People with very limited or monotonous diets
- People experiencing food insecurity or poverty
- People with alcohol use disorder
- People who smoke, since smoking increases vitamin C needs
- Infants and older adults with restricted diets
- People with malabsorption conditions, such as inflammatory bowel disease
- People with psychotic-spectrum disorders, such as schizophrenia
A recent systematic review looked at published cases of scurvy occurring alongside psychotic-spectrum disorders[1].
The review found 19 patients across 18 reports, most middle-aged and male[1].
It described two main pathways that led to low vitamin C intake in these patients[1].
The first pathway was psychosis that directly restricted eating, such as delusional beliefs about food contamination or rigid food rules[1].
The second pathway was negative symptoms of psychosis, like low motivation, that led to self-neglect and irregular meals[1].
In this review, diets were often very limited and lacked any fresh produce[1].
In about a quarter of cases, worsening mental or behavioral symptoms were actually the reason the person first sought medical care, before scurvy was recognized[1].
This suggests scurvy can sometimes hide behind a psychiatric presentation, making it easy to miss.
What are the symptoms of scurvy?
Early symptoms are often vague.
- Fatigue and weakness
- Irritability
- Joint or muscle pain
- Bleeding or swollen gums
- Easy bruising
- Small red or purple spots on the skin
- Corkscrew-shaped body hair
- Slow healing of wounds
- Anemia
In severe or long-standing cases, scurvy can affect the joints and bones enough to limit movement.
Left untreated for a very long time, scurvy can become life threatening.
How is scurvy diagnosed and treated?
Doctors diagnose scurvy by combining a person's diet history, symptoms, and a blood test for vitamin C levels.
Because early symptoms overlap with many other conditions, scurvy is often missed at first.
Clinicians are encouraged to consider vitamin C deficiency when skin, joint, or blood symptoms appear alongside poor self-care or a very monotonous diet[1].
Treatment involves restoring vitamin C through food or supplements.
In the reviewed cases, physical symptoms of scurvy typically improved within days to weeks after vitamin C repletion began[1].
Refeeding needs care in people who are severely malnourished, since reintroducing nutrients too quickly can cause a dangerous complication called refeeding syndrome[1].
In the review, one patient died from refeeding syndrome, showing why medical supervision matters in severe cases[1].
How much vitamin C do you need?
Most adults need about 65 to 90 milligrams of vitamin C per day.
People who smoke need more, since smoking increases how fast the body uses vitamin C.
Scurvy typically develops after intake stays below about 10 milligrams a day for a month or longer.
This means the gap between a healthy amount and a scurvy-causing amount is large, and scurvy usually reflects an almost total absence of vitamin C sources, not just a slightly low diet.
What foods have vitamin C?
Vitamin C is found mainly in fruits and vegetables.
- Citrus fruits, like oranges and grapefruit
- Bell peppers
- Strawberries and other berries
- Kiwifruit
- Broccoli
- Brussels sprouts
- Tomatoes
- Potatoes
Cooking can lower vitamin C content, since the vitamin breaks down with heat and dissolves in water.
Eating some fruits and vegetables raw or lightly cooked helps preserve more vitamin C.
What to do if you're at risk
If you or someone you care for eats very little fresh produce, a few simple steps can help.
- Include at least one vitamin C food, like citrus fruit or peppers, at a meal each day
- Watch for early signs, such as bleeding gums, easy bruising, or unusual fatigue
- Take note of very restrictive or repetitive eating patterns, especially alongside mental health symptoms
- Ask a doctor about checking vitamin C status if diet has been extremely limited for weeks
- Involve a mental health or medical provider early if psychosis or self-neglect is affecting eating
- Avoid starting large amounts of food or supplements abruptly after a long period of malnutrition, and seek medical guidance first
Family members and caregivers can play a key role by noticing changes in eating habits over time.
For people with psychotic-spectrum disorders, coordinated care between psychiatry and general medicine may help catch nutritional problems earlier[1].
Frequently asked questions
Can scurvy happen without a severely restricted diet?
Scurvy usually needs a long period, often a month or more, of very low vitamin C intake, so it rarely happens with a normal, varied diet.
Is scurvy only a historical disease?
No, scurvy still occurs today, particularly in people with limited diets, food insecurity, alcohol use disorder, or certain mental health conditions[1].
Can vitamin C deficiency affect mental health symptoms?
Vitamin C deficiency itself is not a known direct cause of psychosis, but case reports show psychiatric symptoms can lead to eating patterns that cause deficiency, and worsening mental state can be the first sign that prompts medical attention[1].
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