8 Signs of a Blood Clot You Should Never Ignore, According to Doctors

Shortness of breath

A blood clot in your lung slows your oxygen flow, and that can leave you feeling winded. “You often won’t have the stamina or breath to make it up stairs. You feel lousy,” says George P. Teitelbaum, M.D., interventional neuroradiologist and director of the Stroke & Aneurysm Center at Providence Saint John’s Health Center in Santa Monica, Calif. Get help quickly, especially if this comes on suddenly.