Cocyx pain can come form a dic bulge-large midline at any lumbar segment, maybe higher. The sacrum and cocys do respond to forces going through the ilium, the SI joint and especially (underscore this one) the symphysis pubis. I would never just treat the cocyx without screening all else. Wish I could help, my apporach to this region is much more thorough than I can express in this paragraph.
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regards
jerry hesch mhs pt
the hesch method