Asperger's symptoms may mimic signs of ADD, but there are many Asperger's kids who also have co-morbid ADD, too. As for bipolar disorder, the two are nothing alike. It's possible to have both, but they are nothing alike in nature. If your son is having tantrums over sensory issues, this is total Asperger's. It doesn't sound a bit like bipolar disorder to me. God bless, and if you have any more questions, feel free to ask!
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