There are some gynecological diseases that can lead to decreased menstrual flow: 1. Like premature ovarian failure can cause decreased menstrual flow and may also cause symptoms such as irritability, insomnia, dreaminess, and relative sensitivity to mood changes. 2. Tuberculous pelvic inflammatory disease can also lead to decreased menstrual flow, often with fever in the afternoon and recurrent lower abdominal pain, and the patient may feel very tired. 3. Polycystic ovary syndrome can The patient will feel very tired. 3. polycystic ovary syndrome will lead to reduced menstrual flow and will manifest as weight gain, increased sweating or delayed menstruation or amenorrhea. 4. damage to the endometrium may also lead to reduced menstrual flow, and the cause of reduced menstrual flow should be identified.