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

Chest pain

A pain in your chest may make you think heart attack, but it could be a pulmonary embolism. “Both a PE and a heart attack share similar symptoms,” says Dr. Navarro. However, PE pain tends to be sharp and stabbing, and feels worst when you take a deep breath.

Heart attack pain often radiates from upper areas of your body like your shoulders, jaw, or neck. The biggest clue is in your breathing—PE pain gets steadily worse with every breath you take. Either way, you need help immediately, so call 911.