The feeling of foul breath in the throat is considered to be caused by purulent tonsillitis, tonsil stones, Helicobacter pylori infection and other diseases. 1. purulent tonsillitis: purulent inflammation of the tonsils caused by bacterial infection, the disease starts rapidly, after the onset of the disease, the patient’s pharynx will have severe pain, and will be accompanied by chills, high fever, general malaise, etc., when purulent secretions accumulate in the tonsil fossa or glandular ducts, the patient may be self-conscious about the throat has a foul smell. 2. Tonsil stones: the accumulation of inorganic salts in the depression of the tonsils, the etiology and pathogenesis of this disease is not clear, mostly associated with recurrent episodes of chronic tonsillitis, the stone is small, the patient usually has no obvious feeling, when the stone becomes large, the patient can appear pharyngeal sensation of foreign bodies, coughing, pharyngeal itching and other symptoms, and the patient may be self-conscious of foul breath in the throat. 3. Helicobacter pylori infection: Helicobacter pylori infection can be caused by chronic gastric mucosal inflammation, ulcers, etc., most patients do not have obvious symptoms, there are symptoms, can appear in the upper abdominal discomfort, nausea, lack of appetite, acidity and other phenomena, in addition, the patient can be infected by Helicobacter pylori, self-conscious of foul breath in the throat. There are many other causes of throat odor, such as sinusitis, etc. It is recommended that patients go to the hospital in a timely manner to clarify the cause of the disease, and follow the doctor’s instructions to standardize the treatment.