If there is no previous case of nocturnal urination, there are two main reasons for drinking the herbal medicine to dispel dampness and nocturnal urination, one is that the herbal medicine to dispel dampness has the effect of diuretic, and the other is due to the increase of drinking water when taking the medicine. All of the above are normal phenomena. Dampness Chinese medicine is mainly divided into wind-dampness medicine, dampness medicine, water-permeable dampness (to promote the operation of water to get rid of dampness) medicine. Among them, water-inducing and dampness-expelling medicines have the functions of inducing diuresis, diuretic and diaphoretic (to improve the problem of incomplete urination and small amount of urination), and inducing dampness and jaundice (to get rid of dampness and jaundice), etc. These medicines are mainly used for treating edema and swelling. These drugs are mainly used to treat edema, dysuria, diarrhea and other water-dampness-induced diseases. Water-relieving and dampness-expelling drugs are prone to consume fluid, and should be used with caution or contraindicated for people with yin deficiency and little fluid, and kidney deficiency with spermatorrhea and enuresis. Some drugs have a strong flux effect, pregnant women should be used with caution. Therefore, the symptoms of nocturnal polyuria after drinking Chinese medicine that removes dampness may be due to the diuretic effect of the diuretic medicine or due to the increase in water intake when taking the medicine. The use of drugs need to be under the professional guidance of the doctor, should not be self-medication, in order to avoid adverse reactions.