Reasons You May Have a Stiff Back A stiff back can make it difficult to complete even the simplest tasks. So, Spine and back specialists are giving the 4 reasons that cause the stiffness in lower back . The best spine doctors in Delhi recommend taking proper diet, regular exercise meditation, and physiotherapy to avoid any lower back pain treatment, surgery, and treatment for joint stiffness . Common reasons behind the stiff Back are following: 1. Tight hamstrings - Your hamstrings run through the back of each of your thighs. Lack of physical inactivity or a lack of stretching increases the stress on your lower back and cause stiffness. Targeted hamstring stretching can gradually lengthen your hamstrings, and can relieve lower back stiffness. 2 Poor sitting posture -The majority of us spend over 8 hours per day sitting down. And the time sitting can take its toll on our lower backs if we are not ...