My back started hurting yesterday out of the blue.  I have done nothing strenuous...and not the middle of my back down to where my buttocks is, is hurting...it was worse this morning, better during the day and now tonight, I am in pain again.  I am 31 years old.  Any ideas?
Hi, From history it seems that you might be having viral infection giving rise generalized weakness, body ache, malaise and fatigue giving you this problem. Take rest. Take analgesic medicine like ibuprofen as needed. Take plenty of water. Within a day or two you will be alright. Ok and take care.