What are the common causes of swelling in the forearm?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Forearm swelling is most commonly caused by injury (such as a sprain, fracture, or bruise), infection, fluid buildup (edema), poor circulation, or inflammatory conditions like tendinitis or arthritis. Identifying the underlying cause is essential, as treatment varies widely depending on the root issue.

Because forearm swelling can range from a minor sprain to a serious circulation problem, understanding what's driving your symptoms early can help you avoid complications and get the right care faster. Take a free, instant, online symptom check to clarify possible causes and confidently navigate your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Forearm swelling may result from several common causes, including:

Injury or trauma: Sprains, strains, fractures, or repetitive use injuries can cause swelling. Infections: Skin infections like cellulitis or abscesses can cause redness, warmth, and swelling. Lymphedema: Blockage of lymph vessels leading to fluid accumulation. Venous insufficiency or blood clots: Poor blood flow or clots can cause swelling and discomfort. Inflammatory conditions: Arthritis or tendon inflammation (tendonitis) may cause swelling around joints or tendons. Allergic reactions: Swelling from bites, stings, or allergen exposure.

If swelling is sudden, severe, painful, or associated with other symptoms like fever or numbness, medical evaluation is important. To better understand what might be causing your forearm swelling, try our free symptom checker for personalized insights.

(References)

Ciocon JO, & Galindo-Ciocon D. (1998). Arm edema, subclavian thrombosis, and pacemakers. Angiology, 9555935.
Gulati D, & Agarwal A. (2010). Wooden foreign body in the forearm--presentation after .... Ulusal travma ve acil cerrahi dergisi = Turkish journal of trauma & emergency surgery : TJTES, 20849059.
Taira N, Mano M, Asano H, Takashima S, Nishi H, Fukuda K, & Komatsubara S. (2001). Primary subclavian venous thrombosis which developed .... Surgery today, 11321344.

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