Worms in the stomach of adults are due to intestinal parasitic infections. Symptoms of infection are atypical and may manifest as loss of appetite, nausea, vomiting, and other digestive discomforts. Intestinal parasitic infections are mostly caused by oral intake of contaminated food or water. Patients may show general digestive symptoms such as loss of appetite, nausea, vomiting, abdominal pain, diarrhea and malnutrition. In addition to this, different parasitic infections can cause different symptoms. Roundworm infection may manifest as cough, shortness of breath, coughing up bloody sputum, etc.; pinworm infection, may manifest as perianal and perineal itching, aggravated at night; tapeworm infection may manifest as perianal itching, seizures, etc.. Parasite infection has a certain incubation period, and clinical symptoms are not typical, not easy to find. Usually should pay attention to prevention, do not contact with infected water, wash your hands before and after meals, and eat vegetables and fruits after washing. If you are infected with parasites, you should seek medical advice and treatment under the guidance of a doctor.