He is deeply interested in social issues.

He used to be a member of the Chinese gang.

He experienced the harsh reality of the underbelly of society.

My grandmother is suffering from Alzheimer's disease.

This epidemic is spreading all over the world.

This epidemic spread rapidly around the world.

It is said that venereal disease was widespread during the Edo period.

She was diagnosed with Addison's disease.

My grandfather has been suffering from diabetes for many years.

My younger sister is hospitalized with a childhood disease.