My 5 year old son periodically complains of headaches. It seems to me they are almost always connected to dehydration. If he has been running around alot, or if it is hot out I have to make sure and keep alot of fluids in him or he will get a whopper of a headache.

I stumbled onto the headache-dehydration connection after reading in several places that a headache is the first sign of dehydration. I tried encouraging fluids before the times he would normally complain of a headache and sure enough, the headaches never appeared.

In hindsight, the connection seems logical because for people with SW CAH their bodies do not retain salt at the proper levels. (Their bodies are "wasting" or passing the salt.) Water follows salt.  So when the body wastes salt it also loses fluids. In our experience this also is confirmed by my son’s large urine output.