When I pop or crack my neck which I do unconsciously an have most of my teen and adult like I am 24 now, it causes a strong tingling sensation underneath my tongue on the left side (my left). It never changes always that side. I have been having severe back pain in the middle to Lower area. I have an unusually large chest cup size L and I m sure that s the cause of the back pain but honestly it s not just my muscles it feels like my spine is being bowed out at the bottom being I almost always sleep on my stomach. I wake up at all hours having to sit with my head basically between my knees to bend my spins the opposite way. I m worried about the tingling tongue though because it s recent nd consistent.