A). Strain: Twisting or pulling a muscle or tendon can result in a strain. It can also be caused by a single instance of improper lifting or by overstressing the back muscles. A chronic strain usually results from overuse involving prolonged, repetitive movement of the muscles and tendons. A sprain often results from a fall or sudden twist, or a blow to the body that forces a joint out of its normal position. All of these conditions stretch one or more ligaments beyond their normal range of movement, causing injury. in addition, there are several factors that put a person at greater risk for a back strain or sprain, including excessively curving the lower back, being overweight, having weak back or abdominal muscles, and/or tight hamstrings (muscles in the back of the thighs).
B). Disk Protrusion: The intervertebral disc is a soft gelatinous structure present in between two vertebrae and aid in absorbing the loads on the spine. Prolonged abnormal loading, sudden loading, trauma, etc., may lead to protrusion of the disc extending into the spinal canal compromising the neural elements.
C). Weakness in thighs, foot and legs
D). Tingling & Numbness, Radiating Pains in legs
E). Stiffness in back & Spasms