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Published on: 8/18/2026

Why does the back of my shoulder hurt when lifting my arm?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pain in the back of your shoulder when lifting your arm is often caused by how you move, poor posture, or repetitive physical activity. Common triggers include overhead lifting, sports, heavy lifting, or awkward sleeping positions that strain the shoulder's muscles, tendons, and joints.

Key causes to consider:

  • Rotator cuff strain or tendinitis
  • Shoulder impingement from repetitive overhead motion
  • Muscle overuse or poor lifting mechanics
  • Posture-related tension in the upper back and shoulder

Because shoulder pain can stem from many different conditions—ranging from minor muscle strain to more serious joint issues—it's important to understand exactly what's driving your symptoms before deciding on next steps. A free, instant, online symptom check can help you quickly identify possible causes based on your specific symptoms and guide you toward the right care, whether that's rest, self-care, or seeing a doctor. Taking a few minutes now could save you time, worry, and unnecessary discomfort later.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Shoulder pain when lifting your arm can be caused by how you move or the physical demands of what you do. Studies show that lifting and lowering objects at different heights can affect your upper arm and shoulder muscles. If you are lifting things often or at certain heights, it might cause strain in your shoulder area.

Here are some possible reasons for shoulder pain:

  1. Lifting Heights: Different lifting and lowering heights can put stress on your shoulder muscles, leading to pain.
  2. Physical Activities: Physical activities, especially those at work or home, can lead to musculoskeletal problems if they involve repetitive movements or awkward positions.
  3. Risk Factors: Physical and psychosocial factors, like stress and how you feel about your work, can also contribute to shoulder pain.

If your shoulder pain persists, you can use this free AI symptom checker to better understand your symptoms and then consider talking to a healthcare provider who can help figure out what might be causing your pain and suggest ways to feel better.

(References)

  • Yoo IG, & Yoo WG. (2015). Effects of different lifting and lowering heights on upper arm .... Work (Reading, Mass.), 26409400.

  • Carugno M, Pesatori AC, Ferrario MM, Ferrari AL, Silva FJ, Martins AC, et al. (2012). Physical and psychosocial risk factors for musculoskeletal .... Cadernos de saude publica, 23033179.

  • Sobti A, Cooper C, Inskip H, Searle S, & Coggon D. (1997). Occupational physical activity and long-term risk .... American journal of industrial medicine, 9131214.

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