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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.