I've been told I have an S-shaped deviated septum, is this serious?

It appears you have had very thorough examinations of your septum and nose.  An S-shaped septal deviation anatomically narrows the internal nasal valve on one side while the other side remains patent.  If you do have an S-shaped septal deviation your complaint is very normal.  The internal nasal valve is an anatomical area within the nose which is bordered by the septum, the sidewall of the nose, and the inferior turbinate (can only be seen with an examination of the inside of the nose).  A thorough examination will elucidate the cause of your obstruction.  If you have an S-shaped deviation the angle between the septum and the sidewall of the nose on the right side is likely narrowed and obstructing your breathing on that side.  A septal deviation at the internal nasal valve can be corrected by a septoplasty.  The septoplasty should has to be performed in such a manner that the exact area of deflection is adequately addressed. 

Evaluation of the septum, the external nasal valves, the internal nasal
valves, the turbinates, inspection for masses, etc. are all part of the
exam. Sometimes an anatomic source cannot be identified.Kenneth Hughes, MDLos Angeles, CA

Hello. An "S" shaped septum refers to a septum that deflects to the left as well as the right (hence the "S" shape). If the S septum is causing nasal airway obstruction and breathing difficulty, it may be corrected for via a septoplasty operation (procedure to straighten the septum). I hope this is helpful. Regards, Anand G. Shah, MD

No, but if the deviated septum obstructs your breathing having it fixed can make your breathing much better!

There are C shape and S shaped septal deviations.  Each is a normal septal cartilage shape and does not make the surgery any more extensive when trying to improve the nasal airway.