If your spayed female cat is producing milk, it's likely due to a false pregnancy. False pregnancy, also called pseudocyesis, occurs when a cat's hormone levels change, causing her to think she's pregnant even though she's not. This condition is not dangerous, but it can be uncomfortable for your cat.
There are many possible causes of false pregnancy in cats, including stress, weight gain or loss, changes in routine, and even being around other pregnant cats. If your cat is displaying symptoms of false pregnancy, such as nesting or excessive licking of her abdomen, it's best to take her to the vet for a checkup. treatment is typically not necessary, but your vet can help you manage your cat's symptoms and make her more comfortable.