I was engaging with what was said because we were specifically talking about a muscle injury to the hamstring not a general argument about the origins of pain - of course not all pain originates from tissue damage but that was the origins of the original posters issues so that is what I was discussing. I am always interested in actually science and I don’t have a problem following logic as I think a 30 year career as a post graduate scientist and now as teacher of Physics and Maths will attest to. I just considered it more relevant to stick to what the OP might have done to his hamstring and how that could be addressed rather than wading through a large amount of additional reading material (I’m sure it’s very enlightening and I’m not suggesting it is not accurate by the way). Also although you obviously pay for physio on an injury it has actually worked so the outlay was worth it. Finally moving an injury is great for rehab - just not straight away …that is why a joint swells after a sprain to protect you from additional damage - as was mentioned at the start the OP has just injured themselves so they need to start with immediate remedial measures and then - yes - sure move onto all the ideas mentioned in your post but it is not the immediate response suggested by most health professionals. I’m sure you can always find minority articles suggesting alternative regimes and as I tell my students regularly the oil industry and Trump can wheel out the odd scientist who suggest that climate change is not due to man made CO2/CH4 emissions (well cow made in the case of methane) - doesn’t mean they are right. 