Swollen male breast tissue caused by a hormone imbalance. Male breast tissue swells due to reduced male hormones (testosterone) or increased female hormones (Oestrogen). Causes include puberty, ageing, medication and health conditions that affect hormones.
Symptoms are breast tissue swelling and tenderness. Treatment may not be required in some cases. In other cases, treatment focuses on managing the underlying condition. Rarely, medical or surgical treatment is necessary.