At present, often drink senna water on the kidney is not clear whether there is damage, but it should be noted that senna belongs to the bitter cold medicine, long-term use of senna may damage the spleen qi, kidney qi. Senna taste sweet, bitter, cold, to the large intestine meridian, with diarrhea heat stagnation, laxative, diuretic effect, mainly used for heat stagnation, constipation and abdominal pain, edema and fullness. However, the herbal infusion can not play a limited medicinal effect, and can not replace the medication to treat the disease. Because senna belongs to the bitter cold medicine, so the weak spleen and stomach, spleen and stomach cold, loose stools of the crowd should be avoided, pregnant women and breastfeeding, menstruation should be used with caution, if the dose is too large, can lead to nausea, vomiting, abdominal pain and other side effects occur. Long-term use of senna will damage kidney qi and aggravate the manifestation of jingguan not solid (kidney deficiency, kidney can not hide essence). Clinically, if the patient is not feeling well, he should go to the hospital in time, under the guidance of a professional physician, do not self-medication, in order to avoid adverse reactions.