During the hot summer, ordinary people often suffer from indigestion such as bloating, loss of appetite, or even inflammation of the digestive tract such as vomiting, diarrhea and fever. Why is it easy to have gastrointestinal symptoms or to suffer from gastrointestinal diseases in summer? We believe there are several reasons: First, bacterial contamination. Bacteria can easily breed at high temperatures, and leftovers or cooked food without proper storage can easily be contaminated with bacteria, causing gastrointestinal infections. At the same time, summer is also the most active season of cockroaches, flies, with these insect vectors to help, the pathogens are more likely to spread. Second, in summer, drinking more water, stomach acid is diluted, its efficiency is forced to reduce, can not effectively decompose food. In addition, stomach acid is a strong acid, PH about 1 to 2, which makes it has a “barrier” energy, most of the pathogens that enter the stomach cavity with eating will be killed, and the diluted stomach acid its sterilization ability will certainly be reduced. Third, raw fruits and vegetables. In summer, fresh fruits and vegetables are available in large quantities, and compared with other seasons, people’s chances of eating raw fruits and vegetables are greatly increased. Raw food is more likely to induce gastrointestinal diseases than cooked food, in addition to bacterial contamination of fruits and vegetables on this factor, there are pesticide residues this problem. Fourth, the stimulation of cold drinks. Cold will stimulate the gastric mucosa contraction, gastric acid secretion is reduced, affecting digestion. The smooth muscle on the intestinal wall is very sensitive to temperature changes, too much cold drinks, low-temperature stimulation of smooth muscle contraction significantly strengthened, and even spasm, causing pain. The cold also causes the intestinal movement to increase, and the food undergoing digestion passes faster in the intestine, thus affecting the absorption of nutrients, which can cause an increase in the number of bowel movements, loose stools and diarrhea. Other factors are such as the impact of air-conditioned rooms and so on. Many people like to be cool, and the air conditioning temperature is turned on low. When people enter the cold space, blood is easily distributed to the muscle surface to protect the cold, and the blood supply to the gastrointestinal tract is relatively reduced, and mucosal repair is affected. In addition, the heat leads to poor sleep and decreased resistance can also induce gastrointestinal diseases. Since the summer, barbecue stalls are springing up all over the streets and alleys, many people like to eat barbecued seafood and animal offal with cold beer, and often after such a feast, many people will go to the hospital for medical attention. The reasons for this are complex, both cold drinks, alcohol, spicy factors that bring gastrointestinal irritation, but also hard to digest barbecue food factors, both a large amount of protein to increase the burden on the gastrointestinal factors, but also the heat of the summer led to food spoilage factors and so on. Therefore, the prevention of intestinal diseases in summer should pay attention to the following aspects: First, the diet should follow the five principles of “warm, soft, light, fresh, less”. Warm, that is, to eat less cold food, warm food is easier to be digested. Soft, that is, the food should be soft, grilled, fried food is not easy to digest, steamed or boiled food and vice versa. Light, the first layer of meaning that “taste light”, including not only do not eat too spicy food, but also pay attention to too sweet, too salty food, the latter two tend to increase the stomach acid, especially for patients with underlying diseases of the stomach, such as duodenal ulcer. Another meaning of light is “light”, that is, to reduce the intake of high-fat foods, such as animal offal, meat, etc., while fresh vegetables, lean meat, fish, eggs, etc. is more desirable. Fresh, of course, means that the diet should be fresh, since leftovers are easily contaminated by bacteria, so it is better to touch less. Less, a small number of meals means. Control the amount of food, should not be too full, etc., so that the work of the stomach and intestines do not overload, so that each time the work can be completed in a timely and high-quality. In addition to the above five points, we also have the following suggestions: due to the amount of sweating in summer, more potassium ions are lost, and at the same time, due to the loss of appetite, eating less, the amount of potassium ions from food intake is less. Therefore, you should pay attention to eating foods that contain potassium. Watermelon is a good diuretic fruit with high potassium content and is recommended to be eaten. The summer diet should also avoid drinking alcohol, because alcohol can directly damage the gastric mucosa. Finally, pay attention to personal hygiene, wash your hands before and after meals, etc. must also be kept in mind. Second, avoid overwork and get enough sleep. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. The air-conditioned environment is a double-edged sword, the lower temperature will improve the quality of sleep and appetite, but may reduce resistance and affect digestion. If you encounter a lack of sleep, you may want to take a nap after lunch to supplement a little sleep. Third, appropriate exercise. Many people regard summer exercise as a fearful way. High temperatures sweat a lot, cardiorespiratory function is affected, it is difficult to sustain and prone to injury such as heat stroke, dehydration, etc.. Stop exercising will certainly reduce these problems, but the body is not exercised its function is bound to decline. It is recommended to exercise in the right temperature environment, such as early morning or evening exercise, or exercise in a constant temperature gym, etc. Swimming is considered to have many advantages, not only to improve cardiorespiratory function, but also conducive to shaping, in the exercise also does not damage the knees (compared with running, brisk walking, squatting and other sports), while the summer heat can be eliminated, is the first choice of summer exercise. Fourth, a calm mind. Psychological problems are considered to be the cause of many diseases, tension, anxiety and other adverse emotions can cause health problems. Summer heat and humidity, work life is already fast-paced city life plus the heat brings irritability, sweaty body feeling, etc. can make negative emotions breed. One of the most common examples is IBS (irritable bowel syndrome), which is triggered by anxiety and stress and manifests as abdominal pain, bloating, diarrhea or constipation, etc. A good state of mind is good for the relief of such diseases. In addition to the above exercise can improve negative emotions, but also recommended to develop hobbies such as reading, listening to music, appropriate participation in social activities, etc., in order to develop a calm and healthy state of mind. Fifth, quit smoking. Many people can not understand the relationship between smoking and gastrointestinal diseases, they think that nicotine is only inhaled into the lungs and not the stomach, should not cause gastrointestinal damage, this is a cognitive misunderstanding. We know that nicotine entering the bloodstream can cause incomplete closure of the pylorus, acid reflux, and also aggravate the damage to the gastric mucosa from alcohol and non-steroidal anti-inflammatory drugs such as cold tablets and painkillers. So from the point of view of gastric disease, quitting smoking is not only something that should be done in the summer, but should be a consistent behavior throughout the year.