I just got a job at mcdonalds, and today had to fill in paper work, however i ticked a box about the illness?

I have ulcerative colitis, (it's under controll, had it for 10years so far)

and the guy said i can't start work until he finds out about it with the other managers or something? do you think this will make them fire me before i've even started?I just got a job at mcdonalds, and today had to fill in paper work, however i ticked a box about the illness?
there only concerns are the amount of work you might miss due to this illness and if you would have restrictions to lifting or standing dont worryI just got a job at mcdonalds, and today had to fill in paper work, however i ticked a box about the illness?
idontthink aslongaskeepyourhandsclean