Please help! i have a sharp pain under my left breast.?

Chest pain: Chest pain is discomfort or pain that you feel anywhere along the front of your body between your neck and upper abdomen. Many people with chest pain fear a heart attack. However, there are many possible causes of chest pain. Some causes are not dangerous to your health, while other causes are serious and even life-threatening. Any organ or tissue in your chest can be the source of pain.