The common causes of bad breath in the morning are oral diseases, gastrointestinal diseases, etc. Patients should choose the appropriate treatment and care according to the different causes of the disease, so as not to delay the condition. 1. Oral disease: If oral cleaning is not in place, long time will make the food residue in the gap between the teeth breeding bacteria, bacteria can decompose the food residue, cause oral disease, the symptoms of bad breath. Patients should pay attention to oral hygiene in their daily life, brush their teeth diligently, use mouthwash and dental floss to help remove oral foreign bodies, and avoid spicy and stimulating foods in their diet. 2. Gastrointestinal diseases: such as peptic ulcer, chronic gastritis may cause bad breath, which may be caused by Helicobacter pylori infection producing sulfur. Can follow the doctor’s instructions to use drugs such as amoxicillin capsules, tetracycline tablets, bismuth citrate potassium particles to treat Helicobacter pylori infection. If the patient gets up in the morning with bad breath and still has symptoms after the usual care and treatment, it is necessary to go to the hospital in time to avoid delaying the condition.