Mastication of the food takes place in the mouth. The nfood then passes into the pharynx. Problems in the mouth are extremely common and although they may be trivial they can produce severe symptoms. Poor dental hygiene is often a factor. A bad taste in the mouth and offensive breath (halitosis), particularly if only noticed by the patient, are psychogenic symptoms. Patients with gastric outflow obstruction rarely have halitosis. Stomatitis is inflammation in the mouth from any cause, such as ill-fitting dentures. Angular stomatitis is inflammation of the corners of the mouth.