He always used to say, 'It's easy to say, but hard to do.'

He is good at expressing his feelings well.

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.

Prevention of infectious diseases affects not only individual health but also the health of the entire society.