Breast glands undergo different changes during different physiological cycles of women, especially before and after menstruation. Before menstruation, the breast glands are engorged with blood, which is often mistaken by patients as a breast lump, and this time, the doctor’s judgment is affected by the visit to the hospital, and it is often necessary to repeat the consultation at a later date, which brings a lot of trouble to the patients who have traveled a long distance to see the doctor. Here are some precautions for patients with breast diseases: 1. The consultation time should be chosen 7~10 days after menstruation, at this time, the breast is soft, and it is easy to touch the breast lump by physical examination or doctor’s checkup, so as to avoid the misleading caused by the hardness of the gland due to the engorgement of the breast. 2. 2. Breast cancer is often misdiagnosed in outpatient clinics, and patients should learn to observe the changes of breast lumps before and after menstruation; if there is no change in breast lumps before and after menstruation, they should consult a doctor in time, and if there is obvious change or pain relief, it is generally not a big problem. 3.If possible, it is better to go to the breast specialist clinic of tertiary hospitals, as they are relatively more experienced, which will reduce the chances of missing the diagnosis and provide suitable auxiliary examination methods. 4.If you have previous breast-related examinations, you should carry them with you so that you can give your doctor some hints or observe the evolution of your condition. 5. Suggestion: Women over 40 years old should undergo mammography, two breast ultrasound examinations and breast specialist examination once a year.