What are the reasons for dark menstrual blood?

Patient's question:

Patient Gender: Male
Patient Age: 25
What is the cause of dark menstrual blood?

Doctor's answer:

Hello, your condition can be checked with a B to examine the inflammation of the uterine appendages. If the B results are normal, it may be related to blood and qi stagnation. You can consult a traditional Chinese medicine practitioner and take Motherwort and White Chicken Phoenix Pill to regulate your condition. In daily life, pay attention to keeping warm and eating less spicy and irritating foods. Dark-colored menstrual blood is caused by qi stagnation and blood stasis, where the menstrual blood accumulates in the uterus for a long time. Wishing you good health.