| ICD9 = | eMedicineSubj = pmr | eMedicineTopic = 242 | }} Coccydynia's a medical term meaning pain in the coccyx or tailbone area, usually brought on by sitting. Synonyms Coccydynia's also known as coccygodynia, coccygeal pain, coccyx pain, coccaglia or (in layperson's terms) buttache. But the term's more specific than just "buttache", which could include pain from sore gluteal muscles, etc., whereas coccydynia refers to pain specifically at the coccyx (for example, tailbone pain). Diagnosis A… (More on Coccydynia)