Heavy menstrual flow after moxibustion during menstruation may be related to moxibustion’s effects of warming the meridians and channels, moving qi and activating blood. Moxibustion is not recommended during menstruation, especially for people with heavy periods. However, there are more specific reasons, so it is recommended to consult your doctor in time. Moxibustion refers to the use of moxa as the main material made of moxa cones or moxa sticks, lit and smoked or warm burned body surface points, to give the body a warm stimulation of a therapeutic method. Moxibustion has the function of warming the meridians and collaterals, elevating yang and lifting the sunken organs, promoting qi and activating blood circulation, eliminating swelling and dispersing knots, and restoring yang to save the body from fainting and unconsciousness by warming and replenishing yang qi. Moxibustion during menstruation may cause increased menstrual flow or prolonged menstrual period, so moxibustion is not recommended during menstruation. If you have heavy menstrual flow after moxibustion during menstruation, it is recommended to stop using it and consult your doctor promptly. If moxibustion is needed, it is recommended to go to a professional medical institution.