Could a curved spine be responsible for back ache?

Yes: Strongly suggest you see a back surgeon. Some are orthopedists who specialize in the back. Some are neurosurgeons and sometimes they work in pairs together.

Sometimes: Curvatures can cause backache.Many other things, can, too, which may/may not be directly related to the curvature.Your best bet may be to start with a dr. who is NOT a surgeon.Osteopathic drs. tend to use non-invasive diagnostics & treatments like manipulation to balance/strengthen muscles,take pressure off nerves, prolotherapy to strengthen weak ligaments, etc. which may be the real cause of pain