Can't tell you about Indian medicals but a deviated septum will cause a consistent blockage of the nose on the side it deviates to. If you have an infection or other causes of a blocked nose which lead to swelling of the lining you may notice it more, but otherwise it cannot change because it is hard bone!!!!
Treatment is a simple operation called a septoplasty where the bone that is deviated is straightened. Takes 15 minutes under a general anaesthetic, home the same day, then a week of a blocked nose.
All you need is a septoplasty so beware doctors advising a turbinectomy which removes the leaf like turbinates in the nose. This can cause significant bleeding
Beware too doctors telling you to also have a rhinoplasty which is a much bigger operation and is rarely necessary.