This is bad. This is due to compression of sciatic nerve and you are developing sciatica
. It is due to sitting for longer time or sometimes sitting while bending forward. If the pain
is severe you need to take painkillers. But I will suggest you some
exercises which releaves the pressure on compressed nerve. As regular
intake of painkiller is harmful. Lie down on your back with arms and legs straight (parallel) to the ground/bed. Then slowly raise one leg without folding at knee, other leg will be flat on ground. Hold for 8 to 10 sec, then slowly bring down. Repeat with opposite leg, then with both legs. Each leg 10 times. You will find result in one week.