hi,your suferring from backache since 7 days so it comes under acute backache.
it may be because of Back strain due to lifting of a heavy object, a fall, a violent jerk (as in case of a sudden car brake).
Injury, road accident, fall of a heavy object, fracture
of the spine, dislocation of a vertebral
if your suffering from same frequent backache for atleast 2,3 months than it may be due to spondylitis
,wrong posture or any gync problm.
so better go for x ray if you are havin frequent backache.
Maintaining a proper posture is of utmost importance.try and sit with your back straight
Using hard beds, firm mattresses.mild exercise will increase muscle tone