Ovarian Cysts in Female Guinea Pigs
Ovarian cysts are extremely common in unspayed female guinea pigs, especially from middle age. This article explains the signs, most notably symmetrical hair loss and a swelling belly, how vets diagnose and treat them, and why spaying is the definitive solution for affected sows.
Quick answer
Ovarian cysts are very common in unspayed female guinea pigs, particularly from about 18 months onward. The classic sign is symmetrical hair loss on both flanks, often with a rounder belly and behaviour changes. They are usually not immediately life-threatening but need veterinary assessment, and spaying is the definitive cure.
Ovarian cysts are extremely common in unspayed female guinea pigs, especially from middle age.
What ovarian cysts are
Ovarian cysts are fluid-filled sacs that develop on a female guinea pig's ovaries. They are one of the most common health problems in unspayed sows, and studies suggest a large proportion of older females develop them. Cysts can grow slowly over months, gradually enlarging the abdomen and causing hormonal effects that show up in the coat and behaviour.
Signs to watch for
The most recognisable sign is hair loss on both sides of the body, symmetrical and usually without itching or scabbing, which helps tell it apart from mites or fungal infections. Other signs include a swollen or pear-shaped abdomen, reduced appetite, low energy, crusty or enlarged nipples, and sometimes crankiness or reduced interest in companions.
Symmetrical hair loss on both flanks is a classic clue to ovarian cysts in female pigs.
How vets diagnose them
An exotic-savvy vet will examine your pig, feel the abdomen for enlarged ovaries, and usually confirm the diagnosis with an ultrasound scan, which shows the fluid-filled cysts clearly. This also lets the vet measure the cysts and rule out other causes of a swollen belly, such as pregnancy, tumours or bloat.
An exotic-savvy vet can confirm ovarian cysts with a gentle ultrasound scan.
Treatment options
The definitive treatment is spaying, which removes the ovaries and cysts and prevents any recurrence, and is often recommended for otherwise healthy sows. For pigs that are not good surgical candidates, a vet may drain a large cyst to relieve discomfort, or use hormone injections to shrink cysts, though these are temporary measures rather than cures. Your vet will weigh the pig's age, health and cyst size when advising.
Living with and preventing cysts
Spaying a young, healthy female is the best prevention and removes the lifetime risk of cysts and related womb problems. If your sow has small cysts that are not causing problems, your vet may recommend monitoring with regular weight checks and belly assessments. Keep an eye on the coat, appetite and abdomen, and report any change promptly.
Quick FAQs
Are ovarian cysts dangerous? They are usually not an immediate emergency, but they can grow large, cause discomfort and worsen over time, so they need veterinary assessment.
Will the hair grow back after treatment? Often yes. Once the hormonal cause is removed by spaying, the coat commonly regrows over the following weeks to months.
Can ovarian cysts be prevented? Yes, spaying a young healthy female prevents them and removes the lifetime risk.
How are ovarian cysts different from mites? Cysts typically cause symmetrical, non-itchy hair loss, while mites cause itchy, patchy loss with scratching and scabs; a vet can distinguish them.