It seems that he is suffering from chuunibyou.

He often behaves strangely because of his 'chuunibyou' (middle-school 2nd year syndrome).

He is showing behavior characterized by 'chuunibyou'.

She was diagnosed with collagenosis.

His father died of Creutzfeldt-Jakob disease.

His father was diagnosed with schizophrenia in the past.

He is receiving treatment for obsessive-compulsive disorder.

In mathematics, it is important to examine the parity of numbers.

This metal has very high malleability.

The sexology class is very interesting.