False pregnancies in cats are rare. The only way to determine if a cat is pregnant or is experiencing a false pregnancy is to visit the veterinarian. Because false pregnancies can sometimes mimic serious conditions, it's important to see the veterinarian right away if pregnancy symptoms are displayed by a cat who wasn't around a male cat during her heat cycle.

A false pregnancy — also known as a phantom pregnancy, pseudocyesis, or pseudopregnancy — occurs when a fully matured female cat displays all of the signs and symptoms of pregnancy without actually being pregnant. False pregnancy typically occurs between six to 12 weeks after the cat has been in estrus, also known as “heat”. False pregnancy does not affect a cat's future ability to breed in subsequent pregnancies.

Symptoms appear six to 12 weeks after the cat has been in heat and may continue for several months after a false pregnancy has been diagnosed. These symptoms include:

The exact cause of false pregnancy is not fully understood. Hormonal imbalances of the hormones prolactin and progesterone are thought to play a role in its development. During the cat's heat cycle, if she is bred with an infertile male cat, her body will ovulate and produce a corpus luteum. It is believed that once the corpus luteum is produced, the cat's body can no longer distinguish between a real and false pregnancy. Other conditions can cause the same symptoms as a false pregnancy in cats and will need to be ruled out by a veterinarian. These conditions include:

The veterinarian will need to know the cat's complete health history, the dates of the cat's previous heat cycle, when symptoms first began, and the nature of the symptoms. The veterinarian will examine the cat and look for swollen mammary glands and signs of nipple discharge, and will feel the abdomen for the presence of kittens.

Blood tests and labs, such as a complete blood count, biochemical profile and a urinalysis will be done. A false pregnancy should present with labs that are normal. An abdominal ultrasound or x-ray may also be done. These tests can look for fluid accumulation in the abdomen or uterus, detect a true pregnancy, determine if a uterine infection is present, and look for organ enlargement.

No treatment is necessary if this is the first false pregnancy that the cat has experienced. Signs and symptoms typically go away within two to three weeks but can last several months. If the cat has experienced recurrent false pregnancies, the veterinarian may recommend the following treatment options:

An ovariohysterectomy may be recommended for recurrent false pregnancies. During an ovariohysterectomy, the veterinarian will remove both ovaries and the uterus from the cat. This is done while the cat is under general anesthesia. The veterinarian will make a small incision into the abdominal wall. The two ovaries are tied off and removed along with the uterus. The cat's incision will then be closed with sutures.

More than one false pregnancy is indicative of a hormonal imbalance. Hormonal supplements can be prescribed by the veterinarian to correct these imbalances and prevent future false pregnancies from occurring. 

Cats who have begun to lactate or have swollen mammary glands should have cold or warm compresses placed on their glands. The compress will help to reduce these secretions. An Elizabethan cone, or “e-collar”, may need to be worn in order to prevent the cat from licking or self-nursing, which will cause lactation to occur. Under the veterinarian's advice, food may also need to be reduced to prevent or stop lactation from occurring. It's important to never strip the milk from the cat, as this will continue lactation rather than ending it.

Cats who have an underlying condition that caused the false pregnancy symptoms will need to follow up with the veterinarian for additional care. If the cat had an ovariohysterectomy, an Elizabethan cone will need to be worn to prevent the cat from licking or biting its sutures.