Bipolar or Bipolar Disorder (previously known as manic depression) is a neurodivergence, so it has that in common with autistic people.

The neurological behaviour of a bipolar person is due to stress-induced chemical imbalances in the brain, that result in extreme swings of mood, levels of anxiety, focus and energy.

Because there is some overlap in behaviours between autistic and bipolar people, adults are often misdiagnosed as bipolar when they are actually autistic.