I was struck with the similarities between a child's behavior when it is assigned to allergies or break through behavior of someone who is diagnosed with a mood disorder. "I can personally attest to the fact that allergies can cause behavior problems. I can now predict when my daughter's allergies are kicking up by watching her behaviors. She has outgrown her food allergies (but is still sensitive to soy) but her inhalant allergies are still present. She tends to become very tense, loud, wound up and argumentative. Her sleep becomes affected. She picks fights and taunts me." My difficult child (in elementary school) would have tense, wound up behavior. Talking loud, shrill, impulsive, pressured even grandiose. My difficult child would sleep little and very restless. We would notice this behavior including some potty issuses and the medications would be adjusted. We didn't have rashes, hives or welts. Asthmatic bronchitis as a toddler but resolved by 5yrs old. I wonder whether allergies are part of the whole picture of mood disorder or is the trigger to mood disorder? The descriptions are so similar as to be eerie. The flip side of the coin is that my difficult child's behavior may have been triggered by some unknown allergan. (He was tested by pediatrician allergist with the whole panel and found to be allergic to nothing). The behaviors may be the same but the triggers different. I just wish we knew more. Just thought I'd see if anyone else has any observations.