Why is the menstrual period light and dark?

Patient's question:

Hemorrhagic Cold Pattern: Menstrual flow is scant, dark with clots, and difficult to expel, accompanied by cold pain in the lower abdomen that is relieved by warmth; normal tongue quality

Doctor's answer:

Irregular menstrual cycle, varying volume, dark-colored, with clots, difficult flow. In such cases, treatment should focus on promoting blood circulation, resolving blood stasis, and regulating qi to alleviate pain. Medications such as Xiaoyao Pills, Qizhi Xiangfu Pills, Cihang Pills, Angelica Sinensis Extract Tablets, Fuke Desheng Pills, and Tiao Jing Buxue Pills can be used for gradual regulation. Wishing you good health. It is recommended to maintain a healthy lifestyle and learn to manage stress. If necessary, seek medical attention promptly.