How can stiff and tight muscles result in back pain?

Our body can move with the help of muscles. And muscles need to be relaxed for there correct movement. but when they are stiff and tight they unable us to move. When we try to move by applyinf force the point of join of muscles get stretched resulting in pain

Due to strain and sprain on nerves of back

Explanation:

Stiffness and tightness leads to sprains and strains which are caused when the muscle remains inactive for a long period of time. Muscle at the back are tight and hence they constrict the nerves and its impulses. Nerve constriction leads to pain sensation. Also a muscle is required to be flexible enough to cause movement. Since the back muscle is tight , it put lot of strain on the spinal nerve which further causes back pain

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