Published on: 6/18/2025
Why might my left arm be swollen without any injury?
Swelling in the left arm without injury can result from circulation problems, lymphatic blockage, infections, allergic reactions, or underlying health conditions.
Explanation
If your left arm swells without an obvious injury, possible causes include:
Lymphedema: Blockage or damage to lymph vessels causing fluid buildup. Venous insufficiency: Poor blood flow or vein blockage can cause swelling. Infections: Skin infections like cellulitis may cause swelling without obvious injury. Allergic reactions: Bites, stings, or allergens can cause localized swelling. Systemic conditions: Heart, kidney, or liver problems can lead to fluid retention. Medication side effects: Some drugs can cause swelling as a side effect.
If swelling persists, worsens, or is accompanied by redness, warmth, pain, or other symptoms, seek medical evaluation.
(References)
- Ciocon JO, & Galindo-Ciocon D. (1998). Arm edema, subclavian thrombosis, and pacemakers. Angiology, 9555935.
- Avrahami R, Gabbay E, Bsharah B, Haddad M, Koren A, Dahn J, & Zelikovsky A. (2004). Severe lymphedema of the arm as a potential cause .... Lymphology, 15693538.
- 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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