Lemon water is a drink containing lemon slices or lemon juice. Proper consumption can relieve summer dryness, thirst, loss of appetite, etc. It can also play a role in resolving phlegm and relieving cough, but if consumed in excess, it may stimulate the gastrointestinal tract and cause discomfort. Lemon water is acidic, and to a certain extent it can promote the peristalsis of the gastrointestinal tract and increase appetite. Lemon water contains a variety of vitamins and minerals, such as calcium, phosphorus, potassium and other nutrients, and appropriate consumption can supplement the body’s nutritional needs. Lemon water contains vitamins that can help improve skin color to a certain extent. Lemon contains a large amount of citrate, which can inhibit the formation of calcium salts and reduce the occurrence of kidney stones and other diseases; vitamin C in lemon water helps to remove free radicals from the body, which can prevent red and bleeding gums, and also has a whitening effect. The citric acid and vitamins in lemon water can play a role in the treatment of diseases such as hypertension and hyperlipidemia. However, lemon water is acidic and tends to stimulate gastric acid secretion. Those who normally secrete a lot of gastric acid will experience acid reflux, heartburn and other uncomfortable symptoms, which may cause damage to erosive gastritis, gastric ulcer, duodenal ulcer, etc. Lemon water also has certain corrosive damage to teeth, and long-term consumption is prone to dental problems such as dental caries. Generally, you can use warm or cold water to soak 1-2 fresh lemons or dried lemon slices to prevent the water temperature from being too hot, resulting in the destruction of vitamins and other nutrients. It is usually recommended that lemon water be taken after meals, as drinking on an empty stomach will stimulate the gastrointestinal tract and also have an effect on digestive function. Gastric patients are not recommended to drink lemon water with high concentration, and the consumption of lemon water with high concentration by gastrointestinal patients may aggravate their condition. In addition, people who are allergic to lemon should avoid drinking it.