* Estrus: If your cat is not spayed, she may be in heat, which can cause her to have a bloody discharge from her vagina, as well as increased vocalization, restlessness, and rubbing against objects.
* Pyometra: This is a bacterial infection of the uterus that can occur in unspayed cats. Symptoms of pyometra include a bloody or pus-like discharge from the vagina, fever, lethargy, and abdominal pain.
* Constipation: If your cat is constipated, she may strain to defecate and produce small, hard stools. In some cases, constipation can also cause a bloody discharge from the rectum.
* Cancer: Some types of cancer, such as uterine cancer or rectal cancer, can cause a bloody discharge from the rectum or vagina. Other symptoms of cancer can include weight loss, decreased appetite, and vomiting.
* Trauma: If your cat has suffered any trauma to her abdomen or rectum, this could also cause a bloody discharge.