Depends. I mean I would get it evaluated. I had CCI and chiari. It was so bad it was life threatening for me by the time I had surgery. For 99% people it’s not the case but it can be serious. I had horrible neurological symptoms at that point and could barely walk a few steps. I have permanent spinal and nerve damage because it went undiagnosed so long. But I never felt like my head was falling or sliding. It was more popping, shooting pains down my arms and legs, neurological issues, pins and needles in arms and legs and places where I didn’t have feeling in my arms and legs. I have had lots of issues with my hardware and am in more pain post surgery then before because of the hardware so don’t recommend a fusion unless 100% needed.