I have been experiencing radiating pain from lower back to foot in left leg while standing( but not while sleeping or sitting) I went to orthopaedic doctor he tested and said no need for MRI, gave nurokind G tablets,and rest for 3 months, He said sciatic nerve is irritated not compressed Is irritation caused by disc between vertebrae or any other reasons? He said I have no slip disc by examining So how my nerve is irritated is it by the disc or any other reasons can I came back to my normal life once pain disappears i.e bending while playing cricket,riding of bikes etc. please help me.