It is best not to drink coffee during menstruation. This is because coffee contains a substance called caffeine. Caffeine can stimulate nerves and cause nervous excitement, which can affect uterine contractions and lead to prolonged periods. In addition, because coffee has an excitatory effect, it can also cause breast swelling and pain, mood changes, emotional changes such as irritability and emotional vulnerability. During menstruation, you should mainly take warm tonic, ensure the supply of nutrients and consume more high protein and coarse fiber foods. During menstruation, eating more coarse fiber foods can promote bowel movements and can reduce abdominal pain and bloating caused by pelvic congestion. Pay attention to rest during menstruation, do not get cold, do not strain, and do not have sex. If sexual intercourse occurs during menstruation, it may cause endometritis, adnexitis, etc. It may also cause endometriosis.