What could cause extreme lower back pain when sitting?

Extreme lower back pain when sitting can have several causes.

1. Sitting Habits: Sitting for long periods or in a bad posture can lead to low back pain. When you sit too much or slouch, it can put extra pressure on your back, which can cause pain.

2. Vibrations: If you are in a place with lots of vibrations, like a vehicle, these vibrations can travel through your body and make your back hurt. The vibrations can affect your spine and muscles, leading to discomfort.

3. Piriformis Syndrome: This is a condition where a muscle in your buttock, called the piriformis muscle, presses on a nerve. This can cause pain in your lower back and legs, especially when you are sitting.

To help with back pain, try to sit up straight, take breaks to stand or walk, and use a chair that supports your back well. If the pain doesn't get better, it's a good idea to talk to a healthcare provider.