He was diagnosed with mental illness.

My sick father is seen by a doctor every day.

He developed an occupational disease due to years of construction work.

He is going to the dermatologist for the treatment of dermatosis.

She had been nursing her father for a long time.

He has laughing sickness, and he can't stop laughing.

He needs special care because of his inherited disease.

He says 'sickness and health start with the mind,' and strives to have positive thoughts every day.

She was diagnosed with Addison's disease.

My grandmother is suffering from Alzheimer's disease.