Nausea after taking diet pills may be due to drug side effects, superficial gastritis, it is recommended to stop using diet pills, and if you have superficial gastritis, you need to actively treat it. In addition, drug weight loss is not advisable, need to exercise, diet regulation to achieve weight loss. Common causes and related recommendations are as follows: 1. Drug side effects: diet pills contain appetite suppressants in their composition, which cause patients to lose their appetite after taking the pills, which in turn leads to nausea, desire to vomit and other digestive tract reactions. Before taking weight loss drugs should pay attention to the detailed view of the instructions, such as nausea, vomiting belongs to the side effects of weight loss drugs, stop taking drugs to reduce the symptoms; 2, superficial gastritis: the ingredients inside the diet pills cause stimulation of the gastric mucosa, causing damage to the gastric mucosa, resulting in superficial gastritis, causing patients nausea, vomiting, epigastric discomfort, acid reflux, heartburn and other symptoms. Patients should go to the hospital in a timely manner to clarify the cause and then treat it symptomatically, such as applying gastric mucosa-protecting drugs, such as bismuth and aluminum thioglycollate, under the guidance of a doctor. Adjustment of gastrointestinal motor function drugs, such as domperidone, metoclopramide, etc. If the examination determines H. pylori infection, anti-H. pylori quadruple therapy should be used for treatment. Drugs that inhibit gastric acid secretion, such as cimetidine, ranitidine, etc., can also be applied. Drugs to neutralize gastric acid, such as sodium bicarbonate, magnesium hydroxide, etc. Therefore taking drugs for weight loss is not healthy and may cause damage to the liver, kidneys and lungs of the body and should be taken with caution. It is best to use a controlled diet plus physical exercise for scientific and rational weight loss.