My sister is in her 5th week of radiation (out of 6) for cancer of tonsils. She is having a pretty rough time this week.
She goes in twice a day for her treatment. On Mondays she sees her oncologist. All is going as it should. She was given
suppositories to help w/ nausea since she cannot keep down the other medication she took orally. As of this afternoon she started
running a fever and just cannot hold anything down. The radiologists have said that she probably has the flu since this is not a condition (fever)
of her radiation treatments. They are saying she continues w/ the fever and vomiting she will have to stay all day at the cancer institute tomorrow
and be I.V'd. She is only 44 and has a family, but I feel that this could be potentially very dangerous and I feel that her oncologist should be told right away.
She is so sick and the family has a wait and see attitude. I want to step in and call the oncologist myself and have him aware of her condition since he saw her on Monday.
I am trying not to butt in but I just want everything that can be done done...

I am not an expert, but when my mother was undergoing radiation for tongue cancer she developed a fever a couple of times because the radiation had beaten up the inside of her mouth so badly that it became infected.She had a hard time using the saline rinse or anything else to clean her mouth because of the pain. I think it is referred to as thrush. She was put on antibiotics and it cleared up both times after about a week. I think this kind of thing is pretty common when a person is having radiation around their mouth.

I agree, I think the oncologist should know, the radiologist should be imforming him. Thrush is caused by radiation, but not treated with antibiotics, as one of the causes of thrush is antibiotics. At this point IV looks like a good route to go. If it is flu, it needs to be addressed as early as possible

First, the oncologist should be kept in the loop in all matters, even if they do not seem related to that doctor