If suffering from gastroenteritis, the main clinical symptoms usually include abdominal pain, diarrhea, nausea, vomiting, or fever. If these symptoms occur, it is best to test the stool and blood to determine whether the infection is bacterial or viral, and then treat accordingly. It is not recommended for patients with gastroenteritis to smoke, as smoking primarily harms the lungs, easily causing chronic bronchitis, asthma, or even allergies. Furthermore, smoking can affect the blood concentration of medications, thus during the treatment of gastroenteritis with oral medications or intravenous infusions, smoking can affect the efficacy of the treatment. Therefore, patients with gastroenteritis should not smoke.