Drinking lemonade does not usually cause vomiting. Lemonade is water made from lemons, which has some acidity. Under normal circumstances, taking lemonade will not cause stomach upset or lead to vomiting. However, try not to drink lemonade on an empty stomach, as this will increase the secretion of stomach acid and may cause stomach upset. Do not take cooler lemonade either, as it may cause irritation to the stomach and cause vomiting. Vomiting is a common clinical symptom and is a protective mechanism of the body. For example, if a harmful substance is ingested, it can be eliminated from the body through vomiting. If the symptoms of vomiting are more obvious, it is recommended to go to the gastroenterology department of the hospital in a timely manner to find the cause of stomach discomfort, nausea and vomiting, and give treatment for the cause of the disease.