There are more reasons for delayed menstruation, such as pregnancy and irregular menstruation. It is best to go to the hospital for a blood test to determine if you are pregnant. If pregnancy is ruled out, delayed menstruation is often considered as menstrual disorders and amenorrhea, which can be regulated with medicines such as tonifying qi and nourishing blood, detoxifying liver and qi, and activating blood circulation and removing blood stasis. According to TCM, delayed menstruation includes late menstruation and amenorrhea, which can be categorized into different types according to the symptoms, such as deficiency of qi and blood, depression of the liver and stagnation of qi and blood, and need to be treated with different diagnosis and treatment. 1. Qi and blood deficiency: Delayed menstruation or even amenorrhea caused by qi and blood deficiency will be accompanied by pale and yellowish color, mental fatigue and weakness. You can use medicines to replenish qi and blood, such as Bazhen Tang and Shiquan Daxin Tang. 2. Liver depression and stagnation of qi: Liver depression and stagnation of qi cause qi and blood not to flow smoothly, delayed menstruation, etc., there will be dark-colored menstruation, blood clots, dysmenorrhea, breast distension and pain, emotional suppression, dark complexion, etc.. You can use medicines to dredge the liver and regulate qi, activate blood circulation and remove blood stasis, such as Seven-Shaped Xiangshu Pill and Jiawei Free Pill. 3. Qi stagnation and blood stasis: Qi stagnation and blood stasis leads to delayed menstruation, as well as scanty menstruation, obvious pain in the abdomen before menstruation, blood clots during menstruation, and even amenorrhea. People with qi stagnation and blood stasis can use medicines such as Blood Stasis Granules and Gui Zhi Fu Ling Pills. If irregular menstruation occurs, it is necessary to consult a doctor in a timely manner, and the doctor will guide the treatment after diagnosis and treatment, not self-medication.