Tumors
Tumors are harmful and abnormal growth in the body that can grow in any part. Whether it grows in your testes, adrenal glands, or pituitary gland, tumors can cause serious damage to your body and hormones. There are some tumors that can trigger your glands to produce more or less testosterones and estrogen, affecting the balance and causing the breast tissue to swell.
Studies have shown that men with gynecomastia have a slightly higher risk of breast cancer. It is best that you visit your doctor or healthcare provider any time you feel or notice unusual breast changes. To avoid complications, the earlier you get treatment, the better you can become.