The growth of a misshapen tumor on the breast may cause pain in the arm. Clinical symptoms of breast anaplastic tumors may include internal breast lumps and breast pain, which may be manifested as breast distension, tingling, and radiating pain in the course of development, resulting in pain in the axilla, chest and ribs, back of the shoulder, and limbs on one side of the lesion. As with other parts of the breast, the growth of staggered tumor may come from the structural disorder of breast tissue during embryonic period, resulting in the change of the normal structural proportion of the mammary gland, and the residual ductal germ and fibro-fatty tissues grow abnormally after birth to form a kind of benign tumorous hyperplasia. Patients can take the way of surgical excision for treatment. Once the patients find the phenomenon of growing misshapen tumor on the breast, it is recommended to go to the regular hospital for examination in time and carry out standardized treatment according to the examination results.