Whether or not you will get diarrhea from drinking saffron in water depends on whether or not the saffron has undergone deterioration such as rot, mold, or moisture. If the saffron has not deteriorated, it generally does not cause diarrhea. If the saffron has deteriorated, blindly drinking may cause diarrhea. However, note that the effective dose of herbal infusion is limited, generally can not achieve a therapeutic effect, if you want to achieve a therapeutic effect is recommended under the guidance of a doctor for formal treatment. 1. generally does not cause diarrhea: saffron belongs to the Chinese herbal medicine, the main effect is to promote blood circulation, dissipate blood stasis pain, daily appropriate to drink some saffron water can play a role in health care. If the choice of saffron did not happen to rot, mold, moisture and other deterioration, drinking water will not generally induce diarrhea. 2. may cause diarrhea: if the saffron has rotted, mold, moisture and other deterioration, the saffron may breed toxic ingredients or bacteria, blindly drinking, may cause irritation of the gastrointestinal mucosa, may induce diarrhea. If you find that the saffron has been spoiled, you need to discard the spoiled saffron and it is not recommended to continue drinking it. The specific use of the drug should be under the guidance of a medical professional.