When High Intelligence Masks ADHD: Signs, Struggles, and the Hidden Cost of Success Many highly intelligent adults with ADHD remain undiagnosed—not because they lack symptoms, but because their intelligence, perfectionism, and drive to succeed camouflage the underlying chaos. If you excel on the surface but constantly battle internal overwhelm, you’re not alone. Here’s how high intelligence can hide ADHD, the unique struggles it brings, and the signs to watch for.