As the pain intensified, Litvinenko asked his wife to call an ambulance for assistance.

The pain usually intensifies with sudden head movement or straining.

The room started to sway again and the pains in his head intensified.

The serpent must have struck him again, because suddenly the pain intensified.

He sighed and the pain in his chest intensified.

Sometimes the pain intensified, and he cried to himself, beyond their comforting.

He'd heard it since they walked into the cavernous room and the pain behind his eyes had intensified.

The pain intensified; he fell on his side holding his stomach.

I wanted to laugh but the pain intensified again.

That pain and loss intensified almost unbearably for just a moment, then turned into something far warmer.