Will stretching help alleviate sciatic nerve pain?

It might help: Best to get evaluated, perhaps a prescription for physical therapy if that's possible. Also sciatica doesn't just happen - it may be a result of accumulation of small injuries and postural contributors (even from a long-ago sprained ankle that changed your leg, pelvic and lower back alignment) or trauma. Get to a good osteopathic physician for adjustment, or to a physical rehab doctor.

It may depending on: The cause of the sciatica and the type of stretching but this is only one part of a comprehensive exercise program for symptom control which would include core muscle strengthening and cardiovascular exercises.

Sure: Most times Massage/Stretching will help muscle pain due to the back pain. If it doesn't help enough, recommend seeing your doctor for a workup.