1, Bad living habits: If women eat irregularly, excessive dieting will lead to insufficient energy intake, which will lead to a large amount of fat and protein being consumed in the body, which will lead to an obvious lack of estrogen synthesis, which will affect menstrual cramps and lead to irregular menstruation.

2, mental diet and drug factors: emotions, mental trauma, excessive tension, sudden changes in the environment and climate, frequent sexual life and poor diet, or some drugs and diseases are the reasons for common irregular menstruation.

3, caused by ovarian development: irregular menstruation of women of childbearing age is generally due to poor ovarian corpus luteum function, often showing a cycle, but the cycle is shortened, or menstrual bleeding is more.

4, caused by neuroendocrine dysfunction: mainly the function of hypothalamus-pituitary-ovary axis is unstable or defective, that is, menstrual disease, which is a common cause of irregular menstruation.

5. Obesity: Women's long-term obesity will lead to endocrine and metabolic abnormalities, which will lead to menstrual disorder, scanty menstruation, amenorrhea and functional uterine bleeding, which are also the reasons for irregular menstruation.