Hello @jtpokerguy and welcome to the discussion. The mucous is not unusual and should subside eventually. This is not a good thing we do to ourselves to kill the cancer, almost a contest of what will win in the end and hopefully it is the patient. What is the status of your husband such as how long out of radiation or in what week of treatments?
Encourage your husband to read some of these discussions in the head and neck group. He can search on specific issues such as mucous, swelling, etc. You can also start a "discussion" about anything related here where you will get feedback directed to you.

I am new to this forum and this Story recently popped up on my news feed. Although my diagnosis is different some of the same post surgery symptom's are the same. I found a a product that has helped me tremendously in this overproduction of mucous. It's call SANE MD VITA AE. It does not require a prescription and can be purchased on Amazon. When I first tried it I took it twice daily for 30 days and after 2 weeks I began noticing improvements in the amount of mucous my body was producing. After 30 days I would say it was under control and tolerable. I continued to take it daily until about day 45 and then noticed it was beginning to dry me out too much, so I stopped taking it for a while and the heavy mucous symptoms returned. So I started taking it once a day and then about after 60 days I begin to dry out too much again. So now I am taking it once a day every other day and the mucous is under control. I would highly recommend trying this if your body is over producing mucous. It also helps keep my sinuses clear as well. Great product.