What should you know about shoulder weakness when lifting arm?

Tell apart pain-limited movement from true loss of power: pain may make you stop, while weakness means the arm cannot rise or stay up despite trying. The rotator cuff helps centre and lift the upper arm. A tendon tear may reduce elevation strength; shoulder instability may make the arm feel unreliable; cervical radiculopathy may alter power or sensation along the arm. The angle where weakness begins, recent activity, injury, clicking, and neck symptoms help guide an examination.

Pause heavy overhead lifting and avoid repeatedly forcing the arm through the weak point. Continue easy movement that does not increase symptoms, and use the other arm for loads when needed. Arrange a physiotherapy or medical assessment if the difficulty is not settling, interferes with dressing or reaching, or follows a sporting or work injury. Do not begin demanding resistance exercises until the shoulder and neck have been checked.

Get urgent help for sudden arm weakness with facial changes, speech difficulty, chest symptoms, or weakness in another limb. Seek prompt review after a fall, forceful pull, visible deformity, or inability to raise the arm. Increasing numbness, a cold or discoloured hand, or repeated slipping of the shoulder also needs timely assessment.

Ask whether the weakness is coming from the tendon, joint, or neck; which tests are needed; and which movements are safe now. Ask when strengthening can begin and what change should trigger an earlier review.