The main difference between Acorus calamus and Nelumbo nucifera is in the aspects of efficacy and main treatment. 1. Difference in efficacy: the efficacy of calamus is to open the orifices and dispel phlegm, wake up the mind and enlightenment, dissolve dampness and open the stomach (through the elimination of dampness so that the gastrointestinal function is normal). The efficacy of Shan Nai is to promote qi and warmth in the center, eliminate food, and relieve pain. 2. The difference between the main treatment: calamus main treatment of phlegm blinding the mind, confusion, damp obstruction of the middle Jiao (dampness hinders the function of the spleen and stomach), distention and stuffiness in the abdomen (abdominal feeling distension and discomfort) pain, forgetfulness, insomnia, deafness and tinnitus, etc.; Nelumbinia main treatment of distension and fullness of the chest and diaphragm, epigastric and abdominal pain (gastro-epigastric and abdominal pain and cold), dietary indigestion, cold dampness, diarrhea, and other diseases. The adverse reactions and contraindications of Acorus calamus and Nelumbo nucifera are not clear. However, caution should be exercised in the use of Yam Nai if there is depressed fire in the stomach and yin deficiency and blood deficiency. If you need to use drugs, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the evidence, according to their own situation, reasonable choice, do not blindly use drugs without authorization, so as not to delay the condition.