During the treatment of Helicobacter pylori, vomiting may occur because the treatment to eradicate Helicobacter pylori involves the use of antibiotics such as clarithromycin and metronidazole. These antibiotics can irritate the gastrointestinal tract. Patients with stronger reactions may experience vomiting during the medication process. Therefore, it is recommended to take clarithromycin and metronidazole about half an hour after a meal. During the treatment period, patients infected with Helicobacter pylori should avoid spicy and irritating foods, drink more water, and consume light and easily digestible foods.