The most common causes of irregular menstruation are the following: 1. Endocrine disorders, such as menstruation affected by the environment, emotions, fatigue, environmental changes, and mood swings, can lead to endocrine disorders that cause irregular menstruation. 2. Certain organic pathologies, such as ovarian decline, can lead to reduced menstruation or prolonged menstrual cycles. 3. 3. due to certain diseases, such as polycystic ovary syndrome, which can cause scanty menstruation. 4. due to endometrial tuberculosis, which can also lead to menopause or reduced menstrual flow. If you find irregular periods or changes in the amount of menstruation, be sure to give an examination.