Mouth bitter nose odor consider pharynx, sinus or oral cavity there is the possibility of lesions, such as acute and chronic sinusitis, tonsillitis, nasopharyngeal cancer, gingivitis, periodontitis. Nasopharyngeal or sinusitis there are acute and chronic inflammatory lesions, the patient’s nasopharynx, sinus secretion increases, nasopharyngeal tumors occurring ulceration, combined with bacterial growth, bacterial decomposition of secretions will present a fishy smell. Repeatedly for a long time nose odor to go to the hospital otolaryngology further to do nasopharyngoscopy and other related examinations, a clear diagnosis and further treatment with medication. When there is acute and chronic inflammation of the pharynx, such as acute and chronic tonsillitis, pharyngitis, inflammation necrosis accumulated in the pharyngeal crypts, the oral cavity will present a long time odor. There are mouth ulcers, or gingivitis, periodontitis, dental caries, or the presence of gastrointestinal dyspepsia oral cavity will also appear odor and bitterness, oropharyngeal inflammation, need to consult the stomatology department to control the inflammation, deal with dental caries, the breath will be relieved; gastrointestinal dyspepsia eat a light diet, reduce the intake of high-calorie and spicy stimulating food, the phenomenon of bitter taste can be improved. If there is any discomfort, you should consult a doctor immediately.