Vomiting after drinking lemonade may be caused by cold food stimulation, unclean diet, stomach diseases and other reasons. 1. Cold food stimulation: If the lemonade is cold, it can stimulate the smooth muscle of the stomach to cause spasms and vomiting after drinking lemonade. 2. unclean diet: if the lemon is not clean, it may cause the stomach to be attacked by bacteria and other pathogens, leading to nausea, vomiting and other symptoms. 3. Stomach diseases: such as chronic gastritis, drinking lemon water can stimulate the secretion of gastric acid, which may aggravate the condition, causing stomach pain, nausea, vomiting and other symptoms. It is recommended that people who vomit after drinking lemonade go to the hospital in time to clarify the cause, and if treatment is needed, it should be standardized under the guidance of a doctor to avoid delaying the condition.