What is the reason for dark menstrual blood?

Patient's question:

Patient Gender: Male
Patient Age: 25
What Causes 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 Wind-Feng 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.