There are many causes of menstrual disorders, for example, endocrine hormone abnormalities, which can be detected on an empty stomach on the second to fifth day of menstruation to rule out any abnormalities in the six hormones, as long as there is an abnormality in one of them. Blood tests for anti-Mullerian hormone can also be performed, as they can determine ovarian function, which can also cause menstrual irregularities when ovarian function is diminished. Ultrasound should also be performed to determine whether there are ovarian cysts in both ovaries and whether there are abnormalities in the shape of the uterus. Because these gynecological diseases can also cause menstrual disorders, after the examination, you can make targeted medication and treatment according to your situation.