I was recently diagnosed with Attention Deficit Hyperactivity Disorder (ADHD) and bipolar mood disorder. Is this a possible combination or is the doctor simply fumbling about with hard words? He also seems very impressed by my first-class honours degree in computer science.
The simple answer to your question is yes. Not only is this a possible combination, but it is also a common one for several reasons, including the possibility that the inheritance of the two might be via genes that are close to one another.