There's a good possibility he is suffering from some undiagnosed mental disorders that play into his decision to attack and his decision whom to attack.

The child I described often suffers from an undiagnosed disorder of sensory integration.

Often older children and teens with undiagnosed bipolar disorder use alcohol and drugs.

"I see a tremendous amount of undiagnosed and untreated mental disorder," Dr. Mason said.

Children with undiagnosed and untreated mental disorders are at risk for substance abuse and delinquency.

The first step in a workup for depression should be a thorough medical checkup to determine whether there is an underlying, undiagnosed physical disorder.

There are no data on the number of cases of ST, because it is largely undiagnosed disorder.

Cardiac-related deaths are usually due to an undiagnosed cardiovascular disorder.

Some of Shaikh's supporters have said he suffered from undiagnosed bipolar disorder.

"Our findings suggest that about one-third of people with major depression have [undiagnosed bipolar disorder]," Swanson says.