I need to explain to someone that Tourette Syndrome is more than just tics. I would like to do this with an analogy. People at my son's school keep saying they haven't noticed any tics, and they have ignored what we've tried to explain about the other symptoms of this spectrum disorder. The Tourette Association says that tics are just the tip of the iceberg, since there are many other conditions that are often associated with TS (comorbid) -- but these people don't seem to be able to take that in.
What would be a good analogy for this? I need something that's really easy for everyone to relate to.