There are a variety of reasons that can lead to back pain.The most common causes are sprain and strain,which is caused to muscles and ligaments, as a result of overstretching.This mainly happens as a result of sudden impact, when we try to lift heavy weight,etc puts so much pressure or our muscles and ligaments.Law back pain is also caused by sitting for prolonged periods or due to participating in exhaustive sports activities.These are not serious problems in general and can be cured easily,even though sprains and strains in the back are associated with acute pain in the back.