Irregular menstruation, less menstrual volume, dark color - what's the reason?

Patient's question:

Patient Gender: Wang
Detailed Condition and Purpose of Consultation: Menstrual volume is low, color is dark, menstrual irregularity

Doctor's answer:

It is recommended that you go to the hospital to check the six sexual hormones. Go for the test on the third day of your period, and you need to fast for blood collection. It is best to drink more brown sugar water, pay attention to rest and warmth, avoid eating raw and cold irritating foods, and have regular physical examinations.