Diagnosis, Treatment, and Long-Term Recovery from CCI Craniocervical Instability (CCI) is one of the most misunderstood and underdiagnosed conditions affecting the upper neck. Over the last decade, awareness has grown, but clear, practical guidance for patients is still hard to find. If you’ve been dealing with persistent dizziness, headaches, neck pain, brain fog, or unexplained neurological symptoms after a car accident, concussion, or whiplash injury, this guide is for you