Getting up in the morning with bitter breath and bad breath may be related to bad habits, indigestion, Helicobacter pylori infection, etc., as follows. 1. Bad habits: If oral hygiene is not properly cleaned, food residues in the mouth fermentation acid production, can also cause symptoms such as bitter mouth. It is recommended to rinse your mouth after meals and brush your teeth diligently (2~3 times/day). 2. Indigestion: When the body’s digestive function is weak, the food in the stomach is not digested or discharged in a timely manner, and over time, the decomposed food volatilizes the odor, causing symptoms such as bitter mouth and bad breath. 3. Helicobacter pylori infection: Infection with Helicobacter pylori will stimulate the gastric mucosa, leading to excessive secretion of gastric acid, increasing the pressure on the stomach, causing acid reflux, bad breath, bitter breath and other symptoms. If the symptoms of bitter breath and bad breath are obvious and persistent, it is recommended to consult a doctor in a timely manner to identify the cause of the disease and target treatment.