Men with breast lumps and pain should first consult a breast surgeon or a general surgeon. The breast surgeon will perform a number of tests, including a physical examination, an ultrasound, a blood test for estrogen and male hormones, and a liver function test. The ultrasound is mainly used to evaluate whether there is breast enlargement, or whether there is any abnormal lump in the breast, and the hormone test will clarify whether there is an imbalance in the male-female ratio. In some men, liver dysfunction may cause insufficient inactivation of estrogen, which in turn causes an imbalance in the estrogen-to-male ratio. If the breast enlargement is caused by the imbalance of estrogen to male ratio, you can take some Tamoxifen drugs to block the effect of estrogen and hormone, and most of the breast enlargement can be improved. If it is due to abnormal liver function, you may need to see a gastroenterologist to clarify the liver function and treat it accordingly. If the examination reveals a lump in the breast gland, the lump will need to be removed for biopsy, which is done in breast surgery.