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Our arm is a powerful resource. Perhaps that is why arm wrestling is a long-honored way to prove one's strength. It's also one of our most used body parts, helping us do so much—lift, move, push, hug.

All articles in Arm

When you notice one arm is suddenly bigger, it can cause immediate concern. In most cases, the reason is because of trauma from an injury or repetitive strain. Other causes include deep vein thrombosis, a bone infection, and cellulitis. Learn more about what causes just one arm to become swollen and the best way to treat.

Arm weakness can limit the range of motion of your arm—affecting your daily activities. Causes include injury from trauma or repetitive strain injury, nerve damage or compression in the neck or upper back, or a blockage in the bloodstream. Left arm weakness with chest pain may need immediate medical attention.

Thoracic outlet syndrome causes pain in your shoulders and neck and numbness in your fingers. It’s caused by compression of nerves or blood vessels in the upper chest. Physical therapy and exercise can help.

See Thoracic Outlet Syndrome treatments

Understand significant loss of muscle mass in the arms symptoms, including 4 causes & common questions.

Carpal Tunnel Syndrome

Carpal Tunnel Syndrome is a painful condition caused by pressure on the median nerve in the wrist. Other symptoms are numbness, tingling, and weakness in fingers. Repetitive motion seems to play a role.
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Severe Elbow Pain

Elbow pain should not be ignored. Conditions that can cause severe symptoms involve multiple areas of the elbow. Learn about the 7 most common causes of elbow pain.
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Swollen Forearm: Causes, Symptoms & How to Treat

Often a swollen forearm is caused by insect bite or contact to certain plants. Forearm swelling with pain may be the result of trauma from an injury. You may also notice redness, sensitivity to touch, and swelling of the hand.
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Causes of Numbness in One Arm

Numbness and tingling in one arm can be as harmless as your arm falling asleep. But it may signal something more serious, such as a stroke.
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