Hello, Pain in the left arm can be due to many causes, ranging from a pulled muscle to a heart attack . Pain in the left arm that is brought on by movement or pushing on the painful area is typically less likely to be heart related. Simple activities, such as lifting weights or moving heavy furniture, can cause a strain or inflammation in the arm muscles or joints. The pain associated with these types of injuries can often be reproduced by simple maneuvers, such as simply pushing on the area in question. Arm pain also can be caused by a pinched nerve in the neck, and moving the neck around may bring on the pain. Pain related to the heart is typically not brought on by moving the arm. In that case NSAIDS(pain killers) and proper rest will help to relieve pain. Left arm pain that gets worse with activity and improves with rest should prompt immediate medical attention, as this may be a sign of heart disease -- especially if the pain is deep and the arm is not tender to the touch. Left arm pain that appears suddenly while at rest, such as when watching television, could also be due to an unstable heart condition. Finally, if the arm pain is accompanied by any combination of chest pain, nausea, vomiting, dizziness, passing out, shortness of breath, unusual sweating, abdominal bloating, cough or wheezing, seek medical attention immediately. Please consult a physician.