Those of you who have thrown out their backs can attest, a pulled muscle can be more painful that a bone fracture or even than giving birth.
When you throw your back out, you are spraining or straining the muscles in the hips. A sprain or strain is a microscopic tearing of the muscle fibers. It is akin to fraying a rope. The muscle is made up of thousands of muscle fibers. When you pull or sprain or strain a muscle, you are tearing some of the fibers of that muscle.
And when that happens, the rest of the muscle reflexively contracts, to prevent further tearing. This is the start of a trigger point.
They are the machines of the body. Every finger movement, every eye blink, every cough and even every toe wiggle is controlled by your muscles. And usually it’s not just one muscle involved. It’s tens to hundreds of muscles for even the smallest movement.
Each flick of the finger fires off millions of neurons throughout the brain, spine and central nervous system to contract and relax these muscle groupings. And all of this is just to scratch your nose.