Cystic Ovaries in Guinea Pigs: What Every Owner of a Female Should Know

In this guide

Ovarian cysts are the most common reproductive health problem in female guinea pigs and are extremely common in unspayed sows (the term for female guinea pigs) as they age. Every owner of a female guinea pig benefits from knowing the signs, since early treatment makes a real difference to the outcome.

How common they are

Research suggests ovarian cysts affect a large majority of unspayed female guinea pigs over two years old to some degree, making this less an unusual illness and more something to actively watch for as a female guinea pig ages.

Types of cysts

• Serous cysts: fluid-filled and non-hormonal, these are the most common type and can grow and multiply over time
• Follicular (hormone-producing) cysts: these release oestrogen and are more likely to cause visible symptoms such as hair loss and behavioural changes

Signs to watch for

• Symmetrical hair loss along both flanks and the lower abdomen, without itching or scabbing
• A pear-shaped body when viewed from above, from abdominal swelling
• Crusty or swollen nipples
• Increased aggression, restlessness, or mounting behaviour, particularly if she previously had a calm temperament
• Reduced appetite, lethargy, or a hunched posture, especially as cysts grow larger
• In some cases, straining to urinate or blood in the urine if a cyst is pressing on the urinary tract

Diagnosis

A vet can sometimes feel cysts by gently palpating the abdomen, but an ultrasound is the standard way to confirm their size, number, and likely type.

Treatment

Unlike in humans, hormonal therapy is not a reliable treatment for guinea pigs. Spaying, either an ovariohysterectomy that removes both the ovaries and uterus, or an ovariectomy that removes just the ovaries, is the only treatment that resolves the problem permanently, and is generally recommended once cysts are causing symptoms. Needle aspiration to drain a cyst under sedation is sometimes used for guinea pigs not well enough for surgery, but this only offers temporary relief since the fluid usually returns.

Risks and considerations

Spay surgery in guinea pigs is more involved than in cats or dogs and carries real risk, so it should only be performed by a vet experienced specifically with guinea pigs. Left untreated, however, cysts can continue growing and, in rare cases, rupture, which is a life-threatening emergency, so the risk of surgery has to be weighed against the risk of doing nothing.

Prevention

Spaying a female guinea pig while young and healthy is the only way to prevent ovarian cysts from developing at all, though this is a personal decision that comes with its own surgical risk and is worth discussing candidly with an experienced exotic vet. For most pet owners, the more practical approach is simply knowing the signs and scheduling regular vet check-ups as your female guinea pig ages, so that cysts are caught and treated while still manageable.

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