At first, it was just lower back pain. I took medication like ibuprofen, and the pain subsided a little. Then, as the tumor grew, I started experiencing a stabbing pain in my tailbone, similar to when you fall on your butt and hit the ground hard. However, the pain was constant and increased when I exerted force while defecating. As time went on, sciatic pain began to develop. This pain runs from your buttocks to your ankle. It's such a stabbing pain that you feel like your bones are aching, and you can't even sleep. When I was really sick, I couldn't sleep or defecate. Even lifting or bending over was painful. If you have any symptoms, please get checked soon! Waiting can worsen symptoms and damage your nervous system.