Pain in the arm can result from a number of factors. Abnormalities or injury of the skin, nerves, bones, joints, blood vessels, and soft tissues of the arm can all result in pain. Arm pain, depending on the location and cause, may be accompanied by numbness, redness, swelling, tenderness, or stiffness of the joints. Sometimes diseases that affect other organs in the body, like peripheral vascular disease or arthritis, can be the cause of pain in the arm. Causes of arm pain range from mild annoyances to severe and potentially life-threatening occurrences, such as chest pain from myocardial infarction (heart attack) and angina pectoris that may radiate (spread) to the arm area. The pain of a heart attack can be accompanied by nausea, difficulty breathing, a sense of pressure on the chest, and other symptoms. Treatments for arm pain depend on the underlying cause.