Published on: 6/18/2025
What could be the cause of my right arm swelling for no reason?
Right arm swelling without an obvious cause can result from fluid buildup due to circulation problems, lymphatic issues, mild injuries, infections, or medication side effects.
Explanation
If your right arm swells without a clear reason, possible causes include:
Lymphedema: Blockage or damage to lymph vessels causing fluid buildup. Venous insufficiency: Poor blood flow causing fluid accumulation in the arm. Unnoticed minor injury: Small strains or bumps may cause swelling even without pain. Infections: Early skin infections like cellulitis may cause swelling before other symptoms appear. Medication side effects: Some medications, such as blood pressure drugs or steroids, can cause swelling. Systemic conditions: Heart, liver, or kidney problems may lead to fluid retention affecting the arm.
If the swelling persists, worsens, or is accompanied by redness, warmth, or pain, it’s important to seek medical evaluation.
(References)
- Suzuki Y, Shinozaki J, Fukushima M, & Suto H. (2002). A case of venous thoracic outlet syndrome recognized by arm .... Radiation medicine, 12126086.
- Pais C, Ferreira J, & Sousa P. (2017). Paget-Schröetter Syndrome, a rare cause of subclavian .... Revista portuguesa de cirurgia cardio-toracica e vascular : orgao oficial da Sociedade Portuguesa de Cirurgia Cardio-Toracica e Vascular, 29898300.
- Davis R, Reed E, & Kraus C. (2020). Arm Pain and Swelling in a College Swimmer. The Journal of the American Osteopathic Association, 31930395.
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