What are the most common symptoms of gynecomastia?

Normal. Gynecomastia "means breasts like a woman." it oftens occurs in puberty and is not serious. Symptoms are mildly enlarged breasts & nipples in a male. But many adolescents are embarrassed by it. Sometimes surgery needs to be done for mental health reasons. Rarely, it is caused by neuroendocrine disorders. Your doctor can help.
May have pain. Adolescent/teenager males often have this enlargement of breast tissues secondary to hormonal surge of puberty etc...It is quite common and require no treatment, or something simple i.e. Ibuprofen for soreness etc.. For older males, this maybe of more concerns. Some are caused by medications, but just remember, men get breast cancers too--just much less than females. Consult your doc... Good luck.
Large male breasts. Gynecomastia is the abnormal development of mammary glandular tissue in a male, resulting in breast enlargement..