Low menstrual flow can be caused by kidney deficiency, blood deficiency, blood stasis and phlegm-dampness, which can be treated with medicines such as Gui Kidney Pill, Tao Hong Si Wu Tang, Cang Fu Gui Yu Pill. Kidney deficiency may be manifested as low or gradually decreasing menstrual flow, dark and thin blood, accompanied by lumbar and knee soreness (a feeling of soreness and weakness in the waist and knees), dizziness, tinnitus, coldness in the abdomen, and nocturnal polyuria, and other symptoms. Treatment is with Qui Kidney Pills to tonify the kidney, nourish blood and regulate menstruation (regulating menstrual irregularities due to blood deficiency). Adverse effects of the drug are not known, and it should not be taken by allergy sufferers or during colds. Patients with blood deficiency may have gradually decreasing amount of menstrual blood or spotting of menstrual blood, which is pale in color and thin in texture, and may be accompanied by vague pain in the abdomen, dizziness, palpitations (rapid heartbeat, often accompanied by panic), and yellowish complexion (yellowish color and lack of luster), and other symptoms. Treatment is with Nourishing Blood Soup to nourish blood and regulate menstruation. Adverse effects of this drug are not known and should not be taken by allergic patients. Patients with blood stasis may show symptoms such as scanty menstrual flow, purplish-colored menstrual blood with blood clots, accompanied by abdominal distension and pain, which is alleviated after the blood clots are discharged. Treatment is with Tao Hong Si Wu Tang to regulate menstruation by activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body). The adverse effects of this drug are not clear, and it should be used with caution in people with bleeding tendency and is contraindicated in pregnant women. Patients with phlegm-dampness may have low menstrual blood volume, pale red blood color, sticky and phlegm-like texture, accompanied by obesity, chest tightness, excessive and sticky leukorrhea, etc. The treatment of phlegm-dampness is to use Cangshui Guiding Phlegm Pill to regulate menstruation. For treatment, Cangshu Guiding Phlegm Pill is used to resolve phlegm and dry dampness to regulate menstruation. The adverse effects of the drug are not clear, and allergy sufferers should not take it. If there is a need for medication, it is recommended to use it under the guidance of a professional physician, not blindly self-medication.