In traditional Asian cultures, it is a practice to modify behaviors and eat certain foods during and after menstruation to prevent blood deficiency and blood stagnation. This is what ultimately causes PMS symptoms, irregular menstruation and ultimately a difficult menopause d/t dry, stuck blood in the uterus. Simple practices such as eating only warm foods and beverages, not doing heavy exercise that causes sweating, and staying out of cold water are common practices during menstruation. As is drinking a blood nourishing chicken soup fortified with Angelica (Dong Gui) , Jujube Dates (Da Zao) and Ginger (Sheng Jiang) for 2-3 days after the period has ended. These herbs act to warm and replenish depleted blood, while also moving the blood to prevent stagnation that causes pain.