I don't understand your statement, "something that they put in his mouth during radiation"?

The phlegm usually doesn't start to be a problem this soon, even close to this soon so you need to have him seen and be sure to write ALL his problems down and make sure their ALL addressed.

Re Liz' comments on the hydration....HEED THEM WITHOUT HESITATION. Force him if need be. His body is under severe attack, not only by the cancer but it's barbaric treatment and he needs a minimum of 48ozs of water and 3000 calories EACH and EVERY DAY from now until at least 1 year POST Tx. Failure to do so will only make matters worse and in some cases near fatally worse. I know from painful experience.


David

Age 58 at Dx, HPV16+ SCC, Stage IV BOT+2 nodes, non smoker, casual drinker, exercise nut, Cisplatin x 3 & concurrent IMRT x 35,(70 Gy), no surgery, no Peg, Tx at Moffitt over Aug 06. Jun 07, back to riding my bike 100 miles a wk. Now doing 12 Spin classes and 60 outdoor miles per wk. Nov 13 completed Hilly Century ride for Cancer, 104 miles, 1st Place in my age group. Apr 2014 & 15, Spun for 9 straight hrs to raise $$ for YMCA's Livestrong Program. Certified Spin Instructor Jun 2014.