Earache post radiotherapy

Hi,

Thank you for taking the time to read this.

5 weeks ago my mam finished a 4 week course of radiotherapy for stage 1 laryngeal cancer. 
she has had the usual side effects and has been extremely unwell however thankfully she now seems to be having more good days than bad. 
she is complaining of intermittent pain in her right ear, tbis only started post treatment. I was wondering if anybody else on this forum had experience of this? 
The ENT team didn't seem to concerned and feel it's likely just a result of the high dose radiation and everything settling down. 
many advice/reassurance would be much appareicated