### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
About 1.5 weeks ago I hurt my back, although I felt no pain until the next morning. I was lifting weights, and I think what happened is during a shoulder press I leaned too far back. I have a pain in my upper lumbar/lower thoracic (can t tell) region. It is 100% pain free until I either hyperextend my back fully or round it fully. When I hyperextend my back, I feel a bruise like pain, similar to when I bruised my tailbone up (although not nearly as painful). I have the bruise feeling when I press on the disc as well. I cannot tell if it is a disc or muscular injury. It hasn t gotten much better over the time I ve had it. The pain isn t bad at all, I can still lift normally (but I m taking it light just incase), but I m scared it s a disc injury. I have no numbness/tingles/any nerve related symptoms. Just wondering if this sounds like a muscle strain of some sort, I don t want to mess with my back! If I had a disc injury, would I know?

### output:

Hi, thanks for posting your concern in the Chat Doctor. Considering your quick recovery, I think it was a mechanical back pain, without any underlying disc problem. As your muscle guarding of the local para spinal muscles are relaxed now, You are pain free. The absence of articular symptoms and absence of tingling and numbness also point to the same. However, to be confirmed that you do not have a spinal injury or post-traumatic disc prolapse, you should consult a local orthopedic surgeon, and have an MRI of LS Spine done. Now, as you are pain free I would also suggest you to perform some abdominal muscle strengthening exercises. Please also avoid prolonged sitting in a fixed posture. For any further questions, please write back.