The first period is one of the typical changes in female puberty, and most women will experience their first period two years after their breasts have developed. Usually around the age of 13, women experience their first period, but it is also considered normal between the ages of 11 and 16 because the degree of growth and development varies from person to person. However, if the first menstruation occurs before the age of 11 or after the age of 16, it is considered abnormal and should be taken seriously. The gonadotropins secreted by the hypothalamus and pituitary gland act on the ovaries to secrete estrogen and progesterone periodically, and the endometrium undergoes cyclic proliferation and shedding under the action of the hormones, resulting in menstrual flow. Menstrual flow usually lasts 2-8 days, with a bleeding volume of 20-60 ml. The blood is mostly dark red and does not clot. During menstruation, most women have no obvious symptoms. A few women may experience a feeling of falling in the abdomen or lumbosacral region, breast swelling, constipation, diarrhea, headache, etc. These symptoms usually ease on their own with the end of menstruation, but if the symptoms are severe or if the menstruation lasts for more than 8 days, it is recommended to seek medical treatment. After menstruation, women should pay attention to keep their vulva clean and take a shower to prevent retrograde infection. Underwear should be washed and replaced in a timely manner, and sanitary napkins should be replaced in a timely manner with products from regular manufacturers, and it is recommended that they be changed every two hours. During menstruation, try to eat less chili, ice-cream and other stimulating foods to prevent menstrual cramps, try to maintain a regular routine, and do not engage in strenuous exercise.