If menstruation does not come for several months, it may be late menstruation or secondary amenorrhea. The specific medication needs to be decided according to the patient’s symptoms, such as Angelica Digitata Drink for patients with kidney deficiency. Late menstruation is the prolongation of the menstrual cycle for more than 7 days, or even 3 to 5 months a row, occurring for more than 3 consecutive cycles. Kidney deficiency can be treated with Angelica Digitata Drink; Blood deficiency can be treated with Da Tian Yuan Decoction; Blood deficiency and cold can be treated with Wen Menstruation Soup; Blood solid and cold can be treated with Wen Menstruation Soup; Qi stagnation can be treated with Wu Yao Soup; and phlegm-dampness can be treated with Cang Pian Guiding Phlegm Pill. Secondary amenorrhea refers to cessation of menstruation for 3 cycles or 6 months or more after the onset of menstruation. For Kidney Qi deficiency, Da Jian Yuan Decoction can be used; for Kidney Yin deficiency, Zuo Gui Wan can be used; for Kidney Yang deficiency, Ten Supplementary Pills can be used; for Spleen deficiency, Ginseng Ling Bai Zhu San can be used; for Essence and Blood deficiency, Gui Kidney Pills can be used; for Qi stagnation and Blood stasis (because of the lack of smooth flow of Qi leading to stagnation of blood), Diaphragm Downward Expelling Stasis Tang can be used; for Cold Congealed Blood Stasis, Warming Menstruation Tang can be used; for Phlegm-Dampness Stagnation, Dang Xi Dampness-Phlegm Treatment Formula can be used. If menstruation does not come for several months, it is recommended to go to the hospital as soon as possible, and do not use medicines by yourself to avoid delaying your condition.