The treatment of chronic gastritis generally depends on whether there is a Helicobacter pylori infection. If there is an infection, the usual approach is a quadruple therapy to eradicate the bacteria, which includes a proton pump inhibitor, two types of antibiotics, and a bismuth compound, lasting for a 10 to 14-day treatment course. If there is no Helicobacter pylori infection, the treatment primarily focuses on symptomatic relief, such as suppressing stomach acid, protecting the gastric mucosa, and enhancing gastric motility, depending on the specific conditions of the patient. As for the duration of intravenous therapy for chronic gastritis, if the patient does not exhibit significant vomiting, intravenous therapy is generally not necessary, as oral medication is sufficient to achieve therapeutic goals. If the patient has severe vomiting and cannot eat, intravenous therapy might be needed. This would focus mainly on suppressing stomach acid and maintaining fluid and electrolyte balance, typically requiring two to three days, and prolonged intravenous therapy is not necessary. (Please follow the doctor's prescription for medication.)