Hi. Nose can get blocked due to several causes. It can be functional causes like nasal allergy or structural causes like a deviated nasal septum, nasal polyps etc. Since you have been having the symptoms for a long time, it is best that you visit a qualified ENT specialist for a detailed evaluation and if necessary, nasal endoscopy. A word of caution, many of the available over-the-counter nasal drops are harmful if used for long durations and it is advisable to use these only under medical supervision. Warm regards, Dr. Aanchal, Therapeia centre, Bengaluru.

Mam, I suggest u get a nasal endoscopy done and if required, a ct scan of the nose. If u have allergy, u will need medicines to keep it under control.