The reasons for low menstrual flow mainly include the following three aspects:

1. Underdevelopment of the uterus. Menstruation is the shedding and bleeding of the endometrium that occurs along with changes in the ovarian cycle. If the uterus is poorly developed, such as a small or deformed uterus, only a small amount of the endometrium will shed during each menstrual cycle, resulting in light menstrual flow. In addition, endometrial tuberculosis causes endometrial lesions or dilation and curettage, which leads to damage to the endometrium, and there may also be low menstrual flow or even amenorrhea.

2. Abnormal hormone secretion. Estrogen can stimulate the proliferation of the endometrium in women. If the hormone secretion in the body is abnormal, the proliferation of the endometrium will not reach the required thickness, resulting in less menstrual flow. Excessive dieting, excessive work and rest, bad mood, reproductive system diseases, etc. will affect the female endocrine environment, leading to abnormal hormone secretion and low menstrual flow.

3. Anovulatory menstruation. Women who do not ovulate will also have menstruation, which is medically called "anovulatory menstruation". This is different from normal menstruation and falls into the category of "functional uterine bleeding". This type of menstruation is characterized by irregular timing and low blood volume.

Precautions for daily life during menstruation:

During the menstrual period, you should try to avoid swimming, bathing, and having sex. The sanitary napkins used must be clean and soft, otherwise they may promote the upward movement of bacteria. It enters the uterine cavity and causes inflammation. If not treated in time, it may lead to infertility in the future. As for the use of tampons (i.e. built-in tampons), in addition to cleaning and changing them frequently, it is best not to use them at night. Because the water absorption capacity of the sanitary tampon is limited, and it is impossible to replace it in time after sleeping soundly at night. At this time, the outflow of menstrual blood is blocked, and it is likely to flow back into the pelvic cavity and cause endometriosis. In addition, strenuous physical activity should be avoided during the menstrual period, as it is also one of the risk factors for endometriosis.

In addition, there are other causes such as abnormal metabolism, hypoglycemia and hypothyroidism. Some people think that stress in life, study, and sleep are not good, and autonomic nervous system dysfunction is also one of the many causes. For some women, feeling exhausted may also cause other symptoms.