What could be the cause of forearm swelling with no apparent reason?

If your forearm appears swollen without a clear trigger, some possible causes include:

Lymphedema: A buildup of lymph fluid, often due to blocked or damaged lymph vessels. Venous insufficiency: Poor blood return from the arm can cause fluid to accumulate. Unnoticed minor trauma: Small injuries or overuse can cause swelling even if you don’t recall a specific incident. Infection (early stage): Swelling might occur before symptoms like redness or pain become obvious. Allergic reaction: Exposure to allergens may lead to swelling that isn’t always painful or itchy. Systemic conditions: Heart, liver, or kidney disorders can lead to swelling in the limbs due to fluid retention. Medications: Some drugs, like those for blood pressure or diabetes, can cause swelling as a side effect.

If the swelling is persistent, worsens, or is accompanied by other symptoms, it’s important to consult a healthcare provider for proper evaluation.