Women 50 years old menstruation just after a few days again may be due to emotional abnormalities, lack of sleep and other physiological factors, may also be due to perimenopausal syndrome, polycystic ovary syndrome and other diseases. 1. Physiological factors: if the patient is often in anxiety, tension and other bad emotions or often stay up late, resulting in sleep deprivation, may be induced by women 50 years old menstruation just a few days and then come back to the situation, is a normal physiological phenomenon. 2. Perimenopausal syndrome: usually refers to the failure of female ovarian function, resulting in neuroendocrine changes in the female body triggered by the clinical manifestations. Patients often appear irregular menstrual cycle, long duration of menstruation and other symptoms, which can be manifested as a woman of 50 years of age menstruation just a few days and then again, and some patients may also be accompanied by palpitations, irritability, hot flashes and other phenomena. 3. Polycystic Ovary Syndrome: The cause of the disease is still unclear, and it is believed that it is caused by a combination of environmental and genetic factors. Patients often have menstrual disorders, which can be manifested as irregular uterine bleeding, menstrual cycle disorders, and so on, and can also occur in women aged 50 years old whose menstruation comes back after a few days. In addition to the above factors, it may also be caused by endometrial cancer, cervical lesions and other malignant diseases. It is recommended that 50-year-old female patients with abnormal menstruation should first rule out physiological factors in time, and if it is caused by diseases, they need to actively seek medical treatment.