What could cause my forearm to be swollen and painful?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Forearm swelling and pain are common symptoms that can stem from a range of causes, including muscle strain, fractures, tendonitis, infections like cellulitis, inflammatory conditions such as arthritis, or circulation issues like blood clots. Mild cases often improve with rest, ice, and elevation, but severe, worsening, or persistent symptoms warrant medical evaluation to rule out serious underlying conditions.

Because forearm pain and swelling can point to many different problems—some minor, some urgent—identifying the likely cause early helps you make informed decisions about care. Take a free, instant, online symptom check to better understand what may be causing your symptoms and confidently navigate your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Possible causes of a swollen and painful forearm include:

Injury or trauma: Sprains, strains, fractures, or overuse injuries can cause swelling and pain. Infections: Skin infections such as cellulitis or abscesses may cause redness, warmth, swelling, and pain. Tendonitis or tenosynovitis: Inflammation of tendons can cause pain and swelling. Blood clots (deep vein thrombosis): A clot in the veins of the forearm can cause sudden swelling and pain. Lymphedema: Fluid buildup from lymphatic blockage can cause swelling and discomfort. Compartment syndrome: A rare but serious condition where pressure builds in muscle compartments, causing severe pain and swelling.

If swelling and pain are sudden, worsening, or accompanied by numbness, weakness, fever, or severe tenderness, seek medical care promptly. To better understand your symptoms and get personalized guidance, try our free symptom checker today.

(References)

Dalton DM, Munigangaiah S, Subramaniam T, & McCabe JP. (2014). Acute bilateral spontaneous forearm compartment syndrome. Hand surgery : an international journal devoted to hand and upper limb surgery and related research : journal of the Asia-Pacific Federation of Societies for Surgery of the Hand, 24641749.
Ciocon JO, & Galindo-Ciocon D. (1998). Arm edema, subclavian thrombosis, and pacemakers. Angiology, 9555935.
Barendse-Hofmann MG, Steenvoorde P, van Doorn L, & Zeillemaker A. (2009). Compartment Syndrome of the Arm After Cable .... European journal of trauma and emergency surgery : official publication of the European Trauma Society, 26814537.

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