He needs special care because of his inherited disease.

He got infected with brucellosis because he was handling cows that were infected with the disease.

He used malingering to skip school.

My sick father is seen by a doctor every day.

His father died of Creutzfeldt-Jakob disease.

He is an expert in psychiatry.

His father was diagnosed with schizophrenia in the past.

He was diagnosed with glycogenosis.

It seems that he is suffering from chuunibyou.

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