Grade 1 gynecomastia causes minor breast development, which is occasionally accompanied by nipple soreness or tenderness. Only a small amount of edoema and perhaps discoloration surround the nipple. Sometimes swollen and soft to the touch, the nipple.

When the patient is wearing clothing, stage 1 gynecomastia is typically not noticeable. However, it can be obvious if the patient is undressed (for example, at a beach or swimming pool), which could be embarrassing.