The side effects and contraindications of lotus seed heart are not clear, but lotus seed heart is bitter in taste and cold in nature, so it is not recommended for those who have a cold spleen and stomach (weak and cold spleen and stomach). The functions of Lotus Seed Heart are to clear the heart and tranquilize the mind (stabilizing the mind by removing internal disturbing heat), to communicate with the heart and kidneys (the fire of the heart descends and the water of the kidneys rises to restrain each other), and to astringe the essence and stop bleeding. It is mainly used for heat entering the pericardium (heat evils invading the pericardium), delirium tremens (delirium, babbling), failure of the heart and kidneys to communicate with the heart and kidneys (heart fire, kidney yin deficiency, and dysfunction of the physiological functions of the heart and the kidneys), insomnia and spermatorrhea, and vomiting of blood with heat in the blood. Because lotus seed heart is bitter and cold, it is easy to hurt the spleen and stomach, such as cold pain in the epigastrium (stomach and abdomen feel cold and painful), loose stools and other symptoms of the spleen and stomach cold may aggravate the condition, so it is not recommended to take lotus seed heart for this group of people. Before taking lotus seed heart should ask the doctor for identification, and under the guidance of the doctor to take, not blindly self-medication.