Clinically, it is considered normal if the period is 3 days early on top of the original one, so 2 days early is also normal. Often, poor rest, emotional changes or environmental changes, excessive stress, and more recent anxiety can lead to this condition, which is within the normal range and can be clinically treated without intervention. If the menstrual cycle is less than 25 days, it is an abnormal condition and the clinic is to give the appropriate examination and give the necessary treatment according to the examination results, for example, ultrasound examination can be done to exclude uterine organic lesions. It is recommended to have a blood test for sex hormone 6 on the second day of menstruation to rule out endocrine disorders that cause shortened menstrual cycle.