QUESTION for those who have chronic illness(es)

A couple of my friends have chronic illnesses to where they have to go to the doctor frequently and expirience annoying symptoms from it alot aswell. A lot of times when they conplain about the doctors visits or pain I try to fix it with telling them things like "oh you should get a heating pad/meditate/take a nap" etc etc but i know it isnt really helping them cuz they've already tried that and more. I wanted to ask people who deal with the same thing how THEY would like to be comforted in that situation. Like what would be the best thing to say for them to know that I agree with them it sucks but try to make them feel better about it. Idk but please give me suggestions id appreciate it as it would help to have better conversations with my friend!!