A condition that is primarily caused, resulting from a hormonal imbalance between estrogen and testosterone is referred to as Gynecomastia. This leads to the enlargement of male breast tissues.  It is a common condition, primarily during puberty and at time in older men, and can impact one or both breasts, may also be uneven. If this condition continues to be persistent and based on the severity it may require medical or surgical intervention. More than a medical condition it is an aesthetic disorder that may affect self-esteem and social discomfort.