The painful knot in her stomach began to dissolve.

He spoke conversationally, calmly, although his stomach was in painful knots.

He stood quietly, making no provocative moves, even as his stomach tied itself in a painful knot.

The muscles of his shoulders and back were tied in painful knots.

But the muscles of Blade's legs were beginning to develop hard and painful knots.

Her insides were a painful knot of worry over Sebastian.

All at once her diaphragm froze in a painful knot and she couldn't breathe.

It made her stomach tighten into a small, painful knot.

There was a painful knot at the back of his neck.

Gorov felt as if hundreds of painful knots were coming untied inside him.