Menstruation once every 22 days may be normal, which needs to be judged according to the previous menstrual cycle. If the usual menstrual cycle has been the same, as long as the relative regularity is basically normal. If the menstrual cycle is suddenly shortened or lengthened, it may be caused by pregnancy, endocrine disorders, endometrial polyps, uterine fibroids, intrauterine devices and so on, and it is recommended to seek medical treatment promptly. 1. Normal situation: Most women’s menstrual cycle is in 21~35 days, if the menstrual cycle is the same, as long as the relative regularity is basically normal, as long as the bleeding is not too much or too little, 22 days once is a normal menstruation. 2. Pregnancy: When abnormal menstruation occurs, the first thing to do is to find out whether there is pregnancy or not, and early pregnancy may lead to miscarriage. 3. Endocrine disorders: polycystic ovary syndrome can lead to endocrine disorders, need to use drospirenone ethinyl estradiol tablets, ethinyl estradiol cyproterone tablets and other adjustments to menstruation. In addition, there may be vaginal bleeding after taking emergency contraceptive pills, if the amount of bleeding is not more than the amount of menstruation, it can be temporarily observed. 4. Organic diseases: uterine fibroids, endometrial polyps, tumors of the female reproductive system, etc. may cause abnormal bleeding manifestations, not a menstrual period, or accompanied by heavy bleeding, need to consult a doctor in time to clarify the condition and actively treat. 4. Intrauterine device (IUD): After placing IUD, especially those containing progesterone drugs, it may cause irregular bleeding, which can be treated with symptomatic treatment such as Yunnan Baiyao and tranexamic acid to stop bleeding, and the IUD needs to be removed if necessary. Menstruation has obvious changes should consult a doctor in time, according to the condition of the doctor’s prescription targeted treatment.