Nasal septal deviations are common. In fact, it is rare to see a perfectly straight nasal septum. Septal deviations do not always cause problem. The main problem that is commonly caused by a septal deviation is airway obstruction. Nasal septal deviations can also cause sinus pain and contribute to infections. 

The most common problem arising from nasal septal deviations is that you just can't breath well through your nose. This is especially likely to bother people at night. It is not usually clear that the problem is entirely from the septal deviation.

For many symptomatic deviations, the only effective treatment is surgery.