Adhd has been found to coexist with other psychological disorders and problems such as oppositional defiant disorder, mood disorders, anxiety disorders, and:

Tics and Tourette syndrome

Explanation:

60% people with Tourette syndrome also have ADHD. Tics are sudden involuntary movements or vocalizations. Tourette syndrome is a more pronounced form of tics which is also characterized by repetitive movements and sounds. Children with ADHD can show these symptoms as early as 10 to 12 years old. They might excessively blink their eyes or clear their throats which gets worse when they are nervous.  

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