No. I'm not sure what condition you would be referring to, but CAH is a condition in which one's body does not properly manufacture cortisol and aldosterone (the body's "stress" hormone and "salts"). Daily medication is taken to replace, as best as it can, these essential hormones. These children (and adults) otherwise lead normal and healthy lifestyles. No one can pick-out a CAH child by observing everyday actions or physical behavior. In times of stress to the system (fever, other illness, surgery, etc.), the CAH patient requires extra medication. There are also complications which a non-CAH patient would not suffer from (i.e., dehydration is a high-risk for salt-losing CAH cases). A "crisis" during times of stress can occur if the cortisol and aldosterone levels are still at an insufficient level, even with extra medication. This can cause a sick CAH child to become extremely ill in a relatively short amount of time. This leads to lethargy and, possibly, shock in the CAH patient. It is quite serious and life-threatening and requires immediate medical attention. However, in all the reading I've done, I've never heard of CAH children who "often collapse". I hope you find whatever information you are looking for.