Pepper water, i.e. peppercorns boiled or soaked in water, has the effect of warming the middle and relieving pain (relieving pain by warming the spleen and stomach), killing insects and relieving itching, and the harmful effects are not yet clear. Pepper water has a limited effect, it is recommended to follow the doctor’s instructions for medication. Pepper is a kind of pungent and warm Chinese herbal medicine, belonging to the stomach meridian, spleen meridian, kidney meridian. It has the effect of killing insects and relieving itching, warming the middle and relieving pain. It is used for cold pain in the stomach and abdomen (stomach and abdomen feel cold and painful), diarrhea, vomiting, insect accumulation and abdominal pain; externally used to treat vaginal itching and eczema. Peppercorns are used in decoction for internal use or external use, and the medicinal effect of peppercorns in water is limited, making it difficult to achieve therapeutic effects. Pharmacopoeia does not specify the adverse effects of pepper, so the harm of pepper has not been clear. It should be used with caution in cases of yin deficiency and fire exuberance (deficiency of yin essence in the body and hyperactivity of deficiency fire). This medicine should be applied rationally under the guidance of a doctor.