The main causes of pain and swelling of tailbone are related to local inflammation, osteophytes, tumor growth or trauma. 1. Local inflammation: If there is inflammation in the area of tailbone, such as fasciitis or arthritis, the stimulation of inflammation will easily lead to local distension and pain or even increase in skin temperature. 2. Osteomalacia: if you often sit on a hard bench or have a bad posture for a long time, it is easy to induce osteomalacia in the tailbone area, which will stimulate the surrounding tissues and trigger the symptoms of swelling and pain. 3. Tumor growth: if there is a tumor in the tailbone, such as bone tumor, it is easy to produce the occupying effect, which will cause a certain degree of extrusion on the surrounding tissues, thus triggering the manifestation of tailbone distension and pain. 4. Trauma: if the coccyx is impacted by external force, resulting in local injury, it is easy to increase the local exudate, which will trigger the feeling of distension and pain, and even accompanied by swelling. If the symptoms of swelling and pain last for a long time and the situation is serious, you need to consult a doctor as soon as possible, and standardize the treatment under the guidance of the doctor to prevent the condition from worsening in the later stage.