Is it possible that a pinched nerve in my neck or back could cause tingling in all my extremities? other causes?

Possible if a large : Enough herniated disc or small enough spinal canal or a combination of both in the cervical or neck region of the spine causing not just a pinched nerve but a pinching or compression of the spinal cord which is called a myleopathy . Other causes can be non spinal as well such as certain vitamin deficiencies, diabetes etc. See your doctor if these persist.

No: A pinched nerve in your neck could cause "tingling" in your arms, and the nerves in your back control your legs. It's possible you could have both at same time although very unlikely. There are several other causes. See your physician for full workup.

Not necessarily: Although a problem in your neck, not back, could cause 4 extremity symptoms, other causes could include a peripheral neuropathy or Multiple Sclerosis. Lots of other considerations. You can choose face to face neurology consult or Concierge virtual online visit here.