What symptoms of low platelet count should I watch for?

Bruising and bleeding that won't stop are the two main signs of a low platelet count. Watch, too, for frequent nosebleeds or a nosebleed that won't stop. Women who are still menstruating need to watch out for heavy flow that seems like it won't let up. Less common symptoms of a low platelet count are blood in the stool or black, tarlike stools; blood in the urine; or a skin rash of pinprick-size red dots.