I'm confused. I've had the usual back pain as the bump gets bigger, ligaments loosen etc. Last week, I did my usual 3 mile walk, getting slower and more cumbersome every time, but was in quite a bit of pain underneath afterwards. It lasted for a few days and seems to come back when I walk for longer than 15 minutes or so. I exercise 3 times a week, aquafit, yoga, walking and cycling and have noticed my back is a bit twitchy for a few hours after yoga but this pain is different. It is right underneath on both sides from back to front. I've heard of the symptoms of both SPD and joint hypermobility and sometimes the lines seem a bit blurred between the two. Can anyone differentiate? Not seeing MW until 7 May.