Behavioral changes in my son

My 8 year old son has been diagnosed with extremely mild ADHD and sensory integration disorder.  He has been seeing a therapist every two weeks for about a year now.  We had been seeing improvements in his behavior until here recently.  Now he has begun crying about random things every evening.  There have been some moments where he is sobbing and he says he doesn't know why.  Do you have any idea what could be the possible cause for this unusual behavior.  My son has never been a sad child. He has always been funny, energetic, and a joy to be around.  His father and I are becoming rather concerned.

[Kevin Kennedy, Ph.D.]

I assume you have discussed this with his therapist who, in addition to you, may be in the best posiiton to know.  Anything I can say to you would be speculation, though i would be very interested in what he happens to be thinking at tghose moments of sadness. Spontaneous bouts of crying can typify a depression, but generally not in young children.