Thats awesome! I wish my flat mates had been as considerate as you are
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Youre already helping him by learning about his condition and taking so much interest. As said before, crohns can cause inflammation of any part of the digestive systom so it has a wide range of symptoms and treatments. My symptoms were mainly severe pain, tiring easily, sickness and weight loss. But this is different for everyone depending on the area of inflammation, how bad it is and the quickness of treatment. A lot of people also get symptoms you might not expect like joint pain, eye problems, headaches etc. And crohns can make people feel pretty isolated or irratated too.
Theres a wide range of medications available now . A lot of the crohns medication has nasty side effects.. My steroids gave me joint pains, headaches, swollen hands and its quite common for them to cause mood swings so thats something to keep in mind if things ever get heated. There are a lot of other medications than can cause more drastic side effects too.
Sometimes medication isnt enough though and we need surgery.
Just keep showing interest and letting him know he can count on you. Maybe help him out with chores if hes not feeling well and if he needs to go the hospital offer a freindly face by going with him. It makes things so much better.
Your flatmate is lucky to have you
if you have more questions feel free to ask them and you or your flat mate can pm me any time