REASONS:
Back pain occurrence can be better understood by knowing the anatomy of our back. Human back is supported by the back bone which is a column of about 30 small bones each known as vertebra. This column starts from the base of skull and ends at the base of the hip bone on which we sit. Each vertebra has a hollow on both the sides and in the middle which together with all vertebrae form a pipe like column through which nervous system passes. Branches of nerve roots pass through each side of vertebra. Each vertebra is separated from each other by jelly like cushion known as discs which allow the flexibility of the spine. From 5th vertebra from the top to 19th vertebra down the line, all vertebrae are joined by the rib bones and therefore have a reasonable amount of support. But the top 4 vertebrae, around which neck muscles are there, and 20th to 24th vertebrae (Lumber vertebrae) around which lower back muscles are joined, do not have much support unless the surrounding muscles are strong enough. While these two areas have to bend in all directions extensively (neck and lower back), supporting muscles need to be strong enough to apply support to vertebrae of these areas. Without enough support, vertebra does not able to take load properly and this results in pressure in the nerves which causes pain, some time severely. Supporting muscles of these two areas, like any other muscles, tend to become soft if not exercised regularly. Back-pain is very common among those who have a sitting job as muscles around lower back become soft and loose the strength to hold on to spine. This results in extra load on nerves around spine. Regular exercise with proper techniques, proper postures keep these muscles strong and back-pain / neck-pain at bay.