Brown sugar, as a flavoring, does not have medicinal properties, and there is no clear information showing that it can be used to treat menorrhagia. According to Chinese medicine, brown sugar is a warm food, often used as a flavoring agent in food therapy, and its therapeutic effect has not been authoritative research data and clinical verification. In addition, there are many reasons for low menstrual flow, and the pathogenesis of this disease is both real and imaginary. The imaginary one is deficiency of essence and blood, insufficiency of qi and blood in Chong Ren and lack of source of menstrual blood; the real one is cold, phlegm and stagnation of qi and blood in Chong Ren, which is not smooth. We need to clarify the cause of the disease and take targeted treatment. Taking brown sugar water is not effective in relieving the symptoms, and is not recommended to avoid delaying the condition. The treatment principle of low menstrual flow focuses on tonifying the kidneys and nourishing the blood, regulating menstruation by activating the blood (regulating menstruation by activating the blood), and tonifying the deficient, and diarrhoeing the solid. Patients with low menstrual flow are not recommended to take brown sugar water to deal with, need to go to the hospital in a timely manner, under the guidance of the doctor for a comprehensive diagnosis, standardized treatment, do not blindly use their own medication, so as not to cause adverse consequences.