I was surprised by his overreaction.

His body is very healthy.

He is suffering from combat stress reaction.

This plant secretes a special liquid.

His body started excessive secretion in response to stress.

When stress builds up, it's easy to get sick.

I decided to start a new project.

He started playing the piano.

Since I started studying Japanese, I have been able to understand more about Japanese culture.

He came to Japan for the first time.