The throat is always involuntary hmmmm may be tonsil hypertrophy, chronic pharyngitis and reflux pharyngitis and so on. 1. Tonsillar hypertrophy: If the patient’s tonsils are enlarged, he or she will always feel the presence of a foreign body in the throat. The feeling is more obvious when swallowing, so the throat will make an involuntary hmmmm sound. 2. Chronic pharyngitis: chronic pharyngitis is a chronic inflammation of the pharyngeal mucosa, submucosa and lymphatic tissues, clinically manifested in the pharynx as a foreign body sensation, secretions are not easy to cough up. So there will always be a hmmmm sound, trying to get the foreign body out. 3. Reflux laryngitis: Reflux laryngitis is a disease triggered by gastrointestinal discomfort or excessive secretion of gastric acid, which leads to reflux of gastric acid to stimulate the throat. The main manifestation is repeated throat clearing action, accompanied by involuntary hmmmm sound, chronic cough, sore throat and other symptoms. When there is always involuntary hmmm in the throat, it is recommended that the patient go to the hospital to receive professional diagnosis and treatment from the doctor.