What conditions might cause forearm swelling without pain?

Swelling without pain in the forearm may result from:

Lymphedema: Fluid buildup due to lymphatic system blockage, often after surgery or radiation. Venous insufficiency: Poor blood flow causing fluid to pool in the arm. Mild injuries or overuse: Minor strains may cause swelling without significant pain. Allergic reactions: Swelling from bites, stings, or allergens may not be painful. Masses or tumors: Rarely, growths pressing on veins or lymph vessels can cause painless swelling. Systemic conditions: Heart, kidney, or liver diseases causing fluid retention.

Persistent or unexplained swelling should be evaluated by a healthcare provider to rule out serious causes.