What may cause severe pain in tailbone area? no redness, no known injury, no constipation. hurts very bad to sit down and hurts very bad to stand up.

Pain in the butt!: You have trigger points in your gluts or ham string muscles that is referring to the tailbone. Think flesh=muscles/tissue and not bone/disc/nerves for this pain! start self-care with a wellness program of vits, magnesium glycinate, sleep hygiene, exercise, self massage, chiropractor, yoga, heat, epsom tub soaking, and stretching. I use a.Acupuncture!

Coccydynia: Sometimes, people are born with a malformed coccyx and this can be a source of chronic pain. It often has to do with a sharp angle between the coccyx and the sacrum. If you have coccygeal pain, a plain x ray could help sort this out.