possible lymphodema in throat

Hi to all those on this forum
I have a friend who developed lymphodema in her chest, back and arm on mast/recon side. That is all being cared for but she is very distressed by a sore throat and pain in the outside of her neck in the throat region. She has been scanned and there is no sogn of cancer, the ENT docs have looked inside and said all ok and her onc says don’t worry. But she does. She read an article recently about a lady with lymphodema in her throat with similar sensations. Has anyone out there got any experience that resembles this and if so how do you manage it?

Many thanks for your help.

Annie xxx