What is the reason for having two menstrual periods per month?

Patient's question:

Detailed medical condition and consultation purpose: Menstruating twice a month
Duration of the current illness and persistence: 3-4 months
Current general condition: Weight gain
Medical history: None
Previous diagnoses and treatment history and effectiveness: None
Ancillary tests: Blood test

Doctor's answer:

A normal menstrual cycle occurs once a month. Your condition may be due to menstrual irregularities caused by endocrine dysfunction. The occurrence of menstrual irregularities not only affects a woman's body but can also lead to gynecological diseases. Therefore, it is best to have a B examination in the gynecology department of a hospital to identify the cause and receive targeted treatment. Pay attention to dietary regulation in daily life, consuming light and easily digestible foods, and avoid spicy, stimulating, and cold foods.