How do i know if i have costochondritis pain and not a heart attack?

Chest pain: Costochondriis is inflammation of the junction between cartilage in the front of the rib cage and the bony rib. It is a sharp soreness that hurts particularly as the chest moves (mist noticeable in inspiration or with palpating). It lasts a split second. Angina is a deeper more visceral sensation. It represents nervous stimulation due to lack oxygen in hert tissue. Lasts minutes.

Character of pain: If pain is alongside your breast bone (sternum) and is worsened by pressing along the ribs there, or worsened by coughing or deep breathing, more likely costochondritis and less likely heart attack ... If worsened by activity, and associated with nausea, sweating, arm or neck pain, lightheadedness, shortness of breath and not with touching the ribs near the sternum, then possibly angina.