Because good grief do I have it at the moment! Not really sure what happened. I was doing a reasonable amount of lifting (computer gear) at the end of last week. And over the weekend I went to the gym a couple of times (nothing heavy, just 20-odd mins on the cross-trainer and a quick swim). On Monday evening, the lower part of my back started to stiffen up and get a little sore. On Tuesday morning it was getting a bit painful to walk and get up (sitting is OK). Now today it took me ten minutes to get out of bed and into an upright chair. I can't stand up straight and my walk now resembles a chimpanzee (in pain). The upper part of my back is fine. The lower bit, just above my pelvis feels very tight and is really very painful when I try to stand up, move from a lying to sitting position or shift my weight. The problem seems to be coming from either side of my spine rather than the spine itself. I took ibuprofen yesterday and it didn't touch the pain. Today I'm on paracetamol and while it takes the very edge of it, it still hurts like hell. Does anyone have any idea what I've done and the best way to get it back to normal?