My back popped while i was bent over and when i stood up it popped. now it hurts where it popped and my hands felt like they got kinda numb when it happened is this serious?

It needs to be check: We don't have enough information to tell you what it might be,as we don't know what part of your back was involved.You might have sprained your back or caused a herniated disc.it needs to be checked since you also feel numbness in your hands. Need a detailed history and comprehensive physical exam.. And may need imaging like MRI

Disc herniation: Acute lumbosacral radiculopathy caused by disc herniation is often extremely painful, but the likelihood of spontaneous improvement is high. For patients with cervical radiculopathy who have clear radicular pain and symptoms of paresthesia, numbness, or nonprogressive neurologic deficits, conservative therapy sould be the initial treatment. Start with oral analgesics and avoidance of painful activ

Back strain: This is consistent with an acute lumbosacral strain. The hand numbness would be unrelated and possibly a result of associated anxiety or hyperventilating. The strained area takes 7-10 days to resolve. Treatment consists of rest, cold applications for 48hours and thereafter intermittent heat. Liniment and,if you can take them,nsaids like Aleve (naproxen) or advil. Your physician can order muscle relaxant.