Sharp stabbing pain when I hyperextend spine

For nearly 6 months I've suffered from a problem with my lower back, just above my pelvis on the left side of my spine. Whenever I bend my spine backwards, I get a sharp concentrated shooting pain on my spine which makes my lower back muscles seize up and leaves me unable to move my back into certain positions until the muscles relax. The pain generally occurs more often when my bowels are gassy, as I suffer from flatulence. At the gym I do deadlifts as well which may have caused this in the first place? Since the pains started I have refrained from deadlifting until I find a remedy. Any advice or possible diagnosis would be much appreciated. Thanks.

It could be many things to be honest. But deadlifts and such symptomatic behaviour might indicate a slight bone malalignment such as a spondylolithesis. In terms of inexpensive investigations a plain x-ray might help to confirm or rule that type of issue out. These things can happen from a small pars fracture on a vertebra which is not uncomment in sports. There are many other causes or referred back pain too and of course if you search the internet on all those you might thinking the end is near, as such symptoms (like drugs side effects) can come from most systemic problems too. So be wary not to self diagnose.

The best way forward is to get some advice following a full physical and movement examination. Go see a good local physiotherapist or osteopath or even a chiropractor to see what they observer through a proper assessment. Let us know how you get on.