A muscle knot in the neck is a tight, contracting muscle that can cause pain, tenderness, and headaches. Common triggers include unhealthy posture, stress, inactivity, overuse, and prolonged sitting.

We tie our shoes, we put on neckties, we wrestle with power cords. Yet despite deep familiarity with knots, most people cannot tell a weak knot from a strong one by looking at them, new Johns Hopkins ...