hello and welcome to health care magic,
I am Dr Sriram Nathan an ENT surgeon and I will try to help you out with your husbands problem.
A severely deviated septum can cause the following:
1. Severe nose block which leads to mouth breathing
and dryness of throat and lips.
2. Nose block so difficulty in breathing especially in the night and when you get a cold
3. Nasal twang of voice
4. More strain during breathing so headache
5. In future development of further block and sinus
These all apply to your husband and the solution is a simple surgery calle d the septoplasty
. If you need any more details about this surgery or this problem you can get back to me
hope this helps
Dr Sriram nathan