I haven't had this issue but would seem strange to have it come on after radiotherapy and it not be connected - may be worth asking in the Ask the Nurses section .
Has anyone who had radiotherapy to the collarbone, in addition to the breast wall, experienced any lasting effect on their throat? I found radiotherapy easy and painless but, a few weeks later, my throat felt a bit off. I now get a gruff voice after speaking for more than a few minutes and find that food often sticks in my throat. This is usually a tiny amount which I can cough out or wash down by pressing on my larynx while swallowing water. A couple of times I’ve had to choke up a mouthful - it’s making me reluctant to eat in public.
My oncologist says it has nothing to do with the radiotherapy but the BCC leaflet links collarbone radiotherapy to sore throat etc. I’m confused and a bit frustrated.