Published on: 6/18/2025
Why could my right arm be swollen without apparent reason?
Right arm swelling without an obvious cause may be due to infections, blood clots, allergic reactions, or medical conditions affecting circulation or lymph flow.
Explanation
Swelling in the right arm can happen even without injury or clear reason because of:
Infections: Skin infections like cellulitis can cause swelling, redness, and warmth. Blood clots (deep vein thrombosis): A clot in the arm’s veins can block blood flow and cause swelling. Allergic reactions: Insect bites, stings, or contact with allergens can lead to swelling. Lymphedema: Fluid buildup due to blockage in the lymphatic system, often after surgery or radiation. Venous insufficiency: Poor vein function can cause fluid pooling. Inflammatory conditions: Arthritis or other diseases can cause swelling. Systemic conditions: Heart, kidney, or liver problems can lead to fluid retention and swelling in limbs.
If swelling appears suddenly, worsens, or is accompanied by pain, redness, or fever, seek medical care promptly.
(References)
- Ciocon JO, & Galindo-Ciocon D. (1998). Arm edema, subclavian thrombosis, and pacemakers. Angiology, 9555935.
- Coates GR, Clements JB, Yium J, & Watlington J. (1988). Painful edema of the arm after insertion of single-needle .... Southern medical journal, 3347860.
- 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.
Tell your friends about us.
We would love to help them too.
For First Time Users
What is Ubie’s Doctor’s Note?
We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.
Learn more about symptoms
Was this page helpful?
Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.