I had nasopharyngeal treatment - radiation and chemo - way back in 2006. There was no surgery was involved. I had no problems with swallowing after my treatment and with the feeding tube removed after treatment - except that I do need to have water or liquid to help in taking in the food. My dysphagia sets in in mid 2020 - that was when I started having issues with speech - slurring and not able to form words properly. And with this - my swallowing was very much affected. I was given to understand that dysphagia is from late effects of radiation. At the moment, I am doing my best to keep up with the dysphagia exercises - in the hope that my condition will not deteriorate to the point when I would have to have feeding tube to keep me alive !!!
As mentioned - my treatment was radiation and chemo, no surgery involved.
Hope this helps!

@phyllisg My husband is now 9 weeks post surgery: Anterior Cervical Discectomy and Fusion (ACDF). He has been unable to swallow (total aphasia) and is on a feeding tube. All the medical professionals we have seen so far tell us it is a waiting issue and could take as long as 12 months to resolve. I'm wondering if anyone else has encountered this and were there any tests that could help determine whether permanent nerve damage may have occured.