The most irritating of the 12 things not to say, is friends passing on well meaning magic treatment cures. Carrot juice, manuka honey, exotic extracts of jungle plants, magnetic bracelets, hypnotherapy, prayer, homeopathic medicine, keto diets. If any of these actually worked dont they think that the medical staff in charge of my treatment would be recommending them. A holiday in Kerela India - now your talking!
I suppose "you must keep positive" is a close second. Dont people think we try our hardest to keep a positive attitude. Sometimes losing it when the treatments and tiredness get the better of us.
As I said you have to forgive them, and not be horrible to them.