Foreign body sensation in one nostril may be caused by chronic simple rhinitis, nasal polyps and nasal septum deviation. 1. Chronic simple rhinitis: It is the hypertrophy of nasal turbinate caused by chronic simple rhinitis, as chronic simple rhinitis will lead to congestion on both sides of the nose, which occurs alternately, and there will also be mucus-like secretion. 2. Nasal polyps: Nasal polyps are bilateral or unilateral. The patient will have a fresh white lychee-shaped lump in the middle nasal tract, which will be obstructed and cause a foreign body sensation in the nasal cavity. 3. Deviated nasal septum: When the spine of deviated nasal septum pierces into the inferior turbinate or middle turbinate, there will be compression symptoms when the mucous membrane of the turbinate is edematous, which will produce headache on the same side and a foreign body sensation in the nasal cavity. Foreign body sensation in the nostrils, it is recommended to go to the hospital in time to clarify the cause of the disease, standardized treatment under the guidance of the doctor.