Guinea pig scurvy (vitamin C deficiency)
Guinea pig scurvy is a disease caused by a lack of vitamin C in the diet. Unlike most mammals, the guinea pig (Cavia porcellus) cannot produce its own vitamin C. It must obtain it entirely through its food, every day. If this supply is...
What is it?
Guinea pig scurvy is a disease caused by a lack of vitamin C in the diet.
Unlike most mammals, the guinea pig (Cavia porcellus) cannot produce its own vitamin C. It must obtain it entirely through its food, every day.
If this supply is insufficient, several functions of the body are disrupted, notably the strength of tissues, healing and joints. It is a common disease in malnourished guinea pigs, but it is easy to prevent.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The first signs are often discreet: the guinea pig becomes less active, eats less and loses weight.
The coat may become dull and less well-groomed.
Over time, pain, stiffness and lameness appear, because the joints and bones are weakened. The animal may refuse to move or have difficulty getting up.
Painful swellings may appear in the joints. The gums can bleed easily and small bleeding can also occur elsewhere (nose, stools) in advanced forms.
A deficient guinea pig heals poorly and is less resistant to infections, which can result in swollen lymph nodes or wounds that do not heal.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The cause is an insufficient intake of vitamin C (ascorbic acid) in the diet, over a period of several weeks.
This typically happens when the guinea pig only receives old pellets or extrudates, poorly stored, or whose vitamin C content has decreased over time (this vitamin degrades quickly after manufacturing and during storage).
A diet low in fresh vegetables and without appropriate supplementation is the most common cause.
Guinea pigs fed only with expired or poorly stored pellets are most at risk.
The absence of fresh vegetables and fruits rich in vitamin C in the ration increases the risk.
Growing young, pregnant or lactating females, and sick or stressed animals have higher needs and are therefore more vulnerable.
Storing food in heat or light accelerates the loss of vitamin C, which is particularly relevant in the Tunisian climate.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian first relies on the animal's dietary history and the clinical examination: condition of the joints, gums, hair, presence of pain or lameness.
There is no simple and reliable routine blood test to confirm vitamin C deficiency in guinea pigs in current practice; the diagnosis therefore remains mainly clinical, supplemented if necessary by x-rays to assess the bone and joint condition.
Treatment
The treatment consists of vitamin C supplementation, prescribed and dosed by the veterinarian according to the animal's condition.
Pain management can be combined if necessary (anti-inflammatories or analgesics adapted to the species).
Overall nutritional support and sometimes feeding assistance are provided if the animal eats little.
If secondary infections are present, antibiotic treatment may be added by the veterinarian.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based on a daily diet including fresh vegetables rich in vitamin C (such as peppers, parsley or other green vegetables suitable for guinea pigs).
You must use pellets specifically formulated for guinea pigs, stored cool and protected from light, and renew them regularly because vitamin C degrades over time.
Vitamin C supplementation may be recommended by the veterinarian in certain situations (growth, gestation, illness), in a form adapted to the species.
You should not rely solely on supplemented drinking water, because vitamin C degrades very quickly.
Possible complications
Without treatment, the deficiency can progress to severe joint and bone damage, complete immobility, secondary infections and significant general weakening.
Advanced forms can put the animal's life in danger, especially if the animal no longer eats at all.
When to see a veterinarian
The guinea pig is eating less or refusing to eat for more than a day.
He limps, seems stiff, or has difficulty getting up.
His gums are bleeding or he has other unusual bleeding.
He becomes unusually downcast or his coat becomes dull.
A joint appears swollen or painful to the touch.
Prognosis
The prognosis is good if the deficiency is identified early and corrected quickly by appropriate supplementation and adjustment of diet.
In advanced forms, with significant joint damage or cessation of eating, the prognosis becomes more guarded and healing may be slower.
Frequently asked questions
Why do guinea pigs need vitamin C while other rodents do not?
Guinea pigs, like humans, do not have the enzyme necessary to produce their own vitamin C. They must therefore receive it every day through their diet, unlike most other rodents.
Are guinea pig pellets enough to cover vitamin C needs?
Only if they are fresh. Vitamin C degrades with time, heat and light, so pellets that are too old or poorly stored may no longer contain enough, even if they were correctly formulated to begin with.
Can we give human vitamin C to a guinea pig without veterinary advice?
It is best to seek advice from the veterinarian before any supplementation, in order to use a form and source adapted to the species and to avoid any excess or imbalance.
How long does it take for a deficient guinea pig to get better?
With rapid treatment, improvement can be observed within a few days to a few weeks, but the duration depends on the severity of the deficiency at the time of diagnosis.
References
AVMA — American Veterinary Medical Association
WSAVA — World Small Animal Veterinary Association
Content reviewed by the TunisieVet editorial team · Updated 30 October 2026
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