[glasscannon]

Not all pain is associated with an existent physical injury. For example I had tears in my achilles last years which have since healed but I still feel pain when I walk. Look into fibromyalgia and nociplastic pain if you want more info. The tldr is that our bodies can react to danger/injuries by increasing our pain sensitivity, which means that minor activities which pre injury caused no pain can later cause debilitating pain even when physically healed. This is why pain is now being explored through a biopsychosocial lens.