Lobelia can be eaten, but Lobelia taste bitter, there is a small poison, need to be taken under the guidance of traditional Chinese medicine to identify the evidence, not blindly take on their own. Lobelia to plant the whole herb into medicine. Longquai taste bitter, slightly sweet, cold, with a small poison, has a heat detoxification (clear the body of heat and poisonous evil), blood circulation and swelling effect, clinically used for bruises and sprains, coughs, carbuncle boils (a skin disease, refers to the degree of serious furuncles), edema and other diseases. Longquan is usually taken as a decoction, but can also be used externally. The adverse effects of Longquai are not clear, and it is forbidden for those who are allergic to it, and caution is needed for those with weak spleen and stomach. Longquan is usually harvested in summer and fall, sun-dried or fresh, and should be placed in a cool and dry place for storage. Patients who are not feeling well are advised to consult a doctor in time, and should not self-medicate to avoid delaying their condition.