Stretching is the best option to avoid back pain suffering if you spend most of your time sitting in a chair. Even if you are battling with back pain, combining stretches with medication is far more beneficial in relieving pain than just using medicines.
The sciatic nerve is located deep in the buttock. Because of its vicinity to the piriformis muscle, constriction or swelling of the muscle may lead to irritation of the nerve and pain. (Psoas Trigger Points Lower Backs)