severe pain
terrible pain

Once I worked with a man who had severe pain.

Have you had severe pain for 4 hours or longer?

There was severe pain in my lower back and I couldn't move for several hours.

What's an average person with severe back pain supposed to do?

He had also been in severe pain for several months since suffering a fall.

They are intended to be used only for a few days to get you through the most severe pain.

Severe pain that does not improve after a few days of home treatment.

Severe pain will usually be present at the point of injury.

The national security adviser looked like he was in severe pain.

He was also having severe back pain, a chronic problem.