fixed cat is in heat...again and again!

My female cat has definitely been fixed, yet every month or so she portrays signs of being in heat.

Help?

My cat, Chatouille, had the same problem. It turned out that the vet had botched the operation and had left a portion of her uterus of phalopian tubes (can't remember which) inside her. It was quite uncomfortable for her and her heats were terribly irregular. She had to have surgery again.:mad: