What could cause my upper arm to be swollen and sore?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Upper arm swelling and soreness are common symptoms that can result from several underlying causes, including muscle strain or injury, infection (such as cellulitis), inflammation from conditions like tendinitis or bursitis, or circulation problems such as blood clots. In some cases, these symptoms may signal a more serious issue requiring prompt medical attention. If the pain worsens, the swelling spreads, or you notice warmth, redness, fever, or numbness, seek evaluation right away.

Because the causes vary widely, identifying the source of your symptoms early is key to getting the right treatment and preventing complications. Take a free, instant, online symptom check to better understand what may be causing your upper arm swelling and soreness, and get personalized guidance on the best next steps for your care.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Possible causes of a swollen and sore upper arm include:

Injury or trauma: Sprains, strains, bruises, or fractures can cause swelling and pain. Infections: Skin infections such as cellulitis or abscesses can cause redness, warmth, swelling, and soreness. Inflammation: Conditions like bursitis or tendonitis can cause swelling and soreness. Blood clots (deep vein thrombosis): Clots in the veins can cause swelling and pain. Lymphedema: Fluid buildup from lymphatic blockage can cause swelling and discomfort. Venous obstruction: Blockage or compression of veins may cause swelling and soreness.

If swelling and soreness are sudden, worsening, or accompanied by fever, numbness, or weakness, seek prompt medical care. To better understand your symptoms and get personalized guidance, try our free AI symptom checker.

(References)

Ciocon JO, & Galindo-Ciocon D. (1998). Arm edema, subclavian thrombosis, and pacemakers. Angiology, 9555935.
Manaqibwala MI, Ghobrial IE, & Curtis AS. (2014). Upper extremity thrombosis presenting as medial elbow .... Case reports in orthopedics, 24772360.
Coates GR, Clements JB, Yium J, & Watlington J. (1988). Painful edema of the arm after insertion of single-needle .... Southern medical journal, 3347860.

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