sentence: risk factors the following risk factors have been identified for coccyx fracture : lack of/reduced muscle mass advanced age osteoporosis being of the female gender ( due to the wider pelvis typically found in females ) violence symptoms of coccyx fracture include : pain that increases in when sitting or getting up from a chair , or when experiencing bowel movement provoked pain over the tailbone nausea bruising or swelling in the tailbone area diagnosis x-rays are usually necessary , but this is not always the case .