Tailbone soreness and leg swelling consider physiological reasons, tailbone trauma, lumbar disc herniation, ankylosing spondylitis, sacroiliitis and so on. 1. Physiological reasons: for example, sitting for a long time or often bedridden local compression, poor blood circulation, there can be soreness and leg swelling, appropriate activities, massage local symptoms can be relieved. 2. Tailbone trauma: When trauma or fracture occurs, the local soft tissue exudates more and more, resulting in swelling, causing tailbone soreness and leg swelling. 3. Lumbar disc herniation: If the lumbar 5 sacral 1 disc herniation compresses the nerve root, it can cause tailbone pain and swelling of the lower limbs. 4. Ankylosing spondylitis: spinal hyperplasia and fusion of vertebrae can cause tailbone pain, which is aggravated at night with morning stiffness. 5. Sacroiliac arthritis: Sacroiliac joint hyperplasia, narrowing of the joint space, causing tailbone pain and pain around the sacroiliac joint, aggravated by exertion or cold. There are many reasons for tailbone pain and leg swelling, if it doesn’t get better by resting, you need to go to the hospital for a checkup, and follow the doctor’s instructions for treatment after a clear diagnosis.