In most cases, yes. ADHD can be caused by early birth, exposure to toxins during the birth cycle, or through heredity. ADHD does carry a high heritable rate, with an approximate estimate of 75% diagnosed know a family member or parent who has the disorder.
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There is a consistent finding in the scientific literature that, in fact, there is a genetic component to ADHD. That is not to say that the condition is a "genetic disorder." ADHD is a clinical category that describes a cluster of similar neurodevelopmental challenges, and the risks include genetic as well as other factors.
One of these genetic risks may be related to post-synaptic dopamine sensitivity. In other words, some people with ADHD may literally be less sensitive to reward than others their age. This is probably something you've observed clinically if you're a parent or a teacher.
There is question about where ADHD arises from, although studies suggest it is genetically inherited.