Irregular menstruation is a relatively common symptom of female friends, once there is an irregular menstruation, it will seriously affect our work and life, accidental irregular menstruation, what are the reasons? 1. Irregular work and rest. Due to the influence of life or work, often stay up late, or work and rest time reversal, this bad work and rest habits can easily lead to endocrine disorders, triggering menstrual disorders. 2. Excessive weight loss. Uncontrolled weight loss or excessive exercise will cause the body not to consume enough protein and fat, thus affecting the normal synthesis of estrogen in the body, resulting in low menstrual volume or amenorrhea. 3, emotional factors. If you are depressed, anxious or under great mental stress for a long time, the hypothalamus function will be damaged and the ovaries will not be able to secrete hormones and ovulate, which will easily lead to irregular menstruation. 4. Abortion. Multiple abortions can lead to thin endometrium, uterine damage is difficult to repair, and even cause irregular menstruation, amenorrhea and infertility. 5, uterine fibroids. Women with uterine fibroids usually have irregular menstruation, mainly in the form of heavy menstruation and extra long periods, the severity of the symptoms depends on the lesion of the fibroids. 6. Thyroid problems. If the thyroid gland is hyper or hypothyroid, it will also affect the ovarian function and make the menstruation become irregular. 7. The effect of birth control ring. The birth control ring is a foreign body outside the body, which can stimulate the endometrium of the female uterus, thus leading to irregular periods and amenorrhea.