The sour taste of Chinese medicine may be due to the drug itself is sour, or drug deterioration, etc. If the drug itself is sour, you can continue to take; if the drug deterioration caused by the sour taste, it is not recommended to continue to take. Drugs have sour, bitter, sweet, pungent, salty five flavors, of which there are many sour drugs, such as: umeboshi, sour jujube nut, cornelian cherry, etc., most of these drugs have astringent and astringent effect, such as umeboshi can astringent lungs, astringent intestines, the treatment of lung deficiency, cough, chronic diarrhea, chronic dysentery, etc.; sour jujube nut can be astringent, the treatment of night sweats (abnormal sweating after going to bed and waking up sweating stops); Cornus officinalis can be astringent and fixed off, etc.. It is normal for these medicines to have a sour taste when taken, and they can continue to be taken. However, if other medicines that do not have a sour taste in themselves and did not have a sour taste when taken before suddenly become sour, it may be due to the deterioration of the medicine and so on, and it is not recommended to continue taking it. If you feel unwell, please go to the hospital and choose whether or not to continue taking the medicine under the guidance of your doctor.