Welcome to the forum.
My son was diagnosed with crohns, May 2011, just before turning 17. As soon as he began to recover from his first flare, he returned back to his sports activities with no problems. We did have him start off a bit slower as he'd just recovered and had lost approx. 25 lbs prior to diagnosis but, within 3 weeks, he was back to playing on both his ball hockey and ice hockey teams throughout the summer (off season/less intense training). By September, his regular seasons began for both his competitive and school hockey teams and he was on the ice 5-7 times per week as well as participating in his school's phys.ed. program.
We did notice that it took him a while to get 'back in shape' as he'd lost so much weight earlier in the year but, crohns-wise, it did not bother him. He's never played football but, hockey can be quite physical as well and the hitting did worry me constantly
, however, again, it didn't seem to have any impact on his crohns (including through shoulder and knee injuries that year).
The only thing that ever caused him any pain, and I do believe it was crohns-related pain (ongoing inflammation in his TI), was when he did long distance running (5-7 km). I think it was the constant bouncing/impact of the long distance that bothered him. When this happened, my son would 'walk' the distance and this alleviated the pain right away. However, this doesn't necessarily happen to everyone... I have read of many other members here who run (and participate in other sports too) with no problems.
Other than the long distance running pain, he's had no problems at all and continues to play on competitive hockey teams as well as playing soccer, basketball, etc. with friends.
Keep in mind, your son should never use nsaids (non steroidal anti-inflammatory drugs such as ibuprofen) as they can cause GI issues. My son did used Voltaren ointment for his shoulder injury, however, even that was used very sparingly and for a very short time. My son has found that Tiger Balm ointment (not an nsaid) works well for aches/pains from training, injuries, etc.
I told his coaches and phys.ed. teachers that Stephen had been diagnosed with crohns, answered any of their questions and requested their understanding if he needed to take a break at times. Pretty much all were very supportive, one teacher (of course, the one running the long distance program :ybatty
did make some minor comments about 'running through the pain' :ymad: but, when Stephen stood firm in that he wasn't going to 'run through the pain' because it wasn't simply a 'running pain', the teacher didn't push it.
I'm sure other parents will be along... there are lots of kids here who participating in running, swimming, dance, soccer, baseball, etc.
You may also want to have a look through the Diet, Fitness subforum... here is a link:
http://www.crohnsforum.com/forumdisplay.php?f=17
Hope that helps!