What are breath abnormalities? The breath exhaled by a person has no special smell. Abnormal breath often comes from food, smokers, alcohol consumption, etc. If exhaling foul-smelling breath or having some kind of special breath is of great significance when seen clinically in oral, respiratory, gastrointestinal and some visceral diseases. So, how should abnormal breath be prevented? Abnormal breath from the oral cavity and nasal cavity can often be detected directly, and abnormal breath from the gastrointestinal tract often has clinical signs of indigestion. Abnormal breath from the bronchus and lungs is often accompanied by cough, large amount of foul sputum, chills, fever, chest pain on the affected side, shortness of breath, excessive sweating, general weakness, lack of appetite, etc. The following are the prevention methods for abnormal breath. 1.Make a good habit of life, do not smoke. 2.Keep a good state of mind and stable emotion. 3.Remove the cause of the disease.