DEAR PADMA, HI,I AM DR KAVITHA.I WOULD LIKE TO HELP YOU. ASSUMING THAT YOU HAVENT STARTED USING A NEW PAIR OF PARTICULARLY HIGH HEELS AND YOUR OCCUPATION DOESNT INVOLVE SITTING FOR LONG DURATIONS,YOU WILL HAVE TO GO BACK 4 WEEKS IN TIME AND TRY TO REMEMBER WHAT YOU WERE DOING IN THE EXACT MOMENT THE PAIN STARTED .THIS WILL GIVE YOU A CLUE AS TO WHAT THE CAUSE MIGHT BE SINCE THERE ARE MANY MANY REASONS FOR LOW BACK PAIN WITH MUSCLE SPASM. MUSCLE SPASM IS USUALLY THE BODY S WAY OF PROTECTING THE VERTEBRAL COLUMN FROM FURTHER INJURY BY LIMITING YOUR ACTIVITY.SPASM CAN ALSO BE CAUSED BY SOMETHING THAT IRRITATES THE MUSCLE. FOR EXAMPLE IF YOU WERE INTO SOME HEAVY LIFTING ,OR JERKY TRAVEL,OR A FAST MOVING SPORT YOU MAY HAVE SLIPPED A DISC ...IN WHICH CASE YOU MAY HAVE TO GO FOR A XRAY/CT/OR MRI AS YOUR ORTHOPEDICIAN MAY ADVICE. IF IT STARTED AFTER A FALL OR AFTER SOMETHING FELL ON YOUR BACK YOU MAY HAVE SOME INJURY TO THE BONE WHICH CAN ALSO CAUSE MUSCLE SPASM I ALSO WANT YOU TO THINK IF YOU HAD ANY OTHER SYMPTOMS BEFORE OR AFTER THE PAIN STARTED LIKE A FEVER,AN ABDOMINAL PAIN,DIARRHOEA,URINARY INFECTION,ANY VAGINAL INFECTIONS OR EVEN A CHRONIC COUGH,ETC BECAUSE THERE IS AN INTRAABDOMINAL PATHOLOGY CALLED A PSOAS ABSCESS THAT IS SO PAINFUL THAT IT CAN CAN EVEN STOP YOU FROM PUTTING YOUR FOOT DOWN DUE TO THE PAIN. SO IF YOU HAVE NOT GOT ANY RELIEF FROM YOUR PAIN SINCE 4 WEEKS I THINK IT IS TIME FOR YOU TO GET A SECOND OPINION PREFERABLY FROM A QUALIFIED ORTHOPEDICIAN.AND PLEASE BE WARY O F DOING EXERCISES AND PHYSIOTHERAPY UNTIL YOU CONFIRM THE CAUSE OF YOUR BACK PAIN.