During menstruation, mothers are prone to mastitis, which is characterized by swelling, pain and fever in the breasts. It can be treated with breast pumping, medication and surgery. Mastitis is an inflammation of the breast tissue with or without infection. Symptoms include swelling and pain in the breast, hard lumps in the breast, milk retention, fever and breast abscess. If the patient has mild symptoms of mastitis during the menstrual period, she can use a breast pump to suck out the lumps, or she can massage them herself or ask a professional lactation consultant to do so. If the symptoms are severe, you need to stop breastfeeding and take antibiotics such as penicillin, which should be used under doctor’s supervision. Severe symptoms need to be incised and drained for treatment, and after drainage, it is important to stop breastfeeding and return the milk. If you are suffering from mastitis, it is recommended that you go to the hospital in time, and under the diagnosis of a professional doctor, you will be treated to prevent the condition from worsening.