The upper neck or the upper cervical spine can arguably be labeled as one of the most important spinal areas. Essentially, all information our body communicates is transferred and received through this area including organ function, body position, body movement commands, subtle energy fields, acupuncture meridians, and more.
Upper cervical tension, whiplash injury, repetitive postures can lead to significant spinal congestion (upper cervical subluxation) which is the cause of many downstream symptoms. There are many chiropractic techniques which approach the upper cervical spine with detail and specificity. I have studied many of them. The techniques which I personally respect include those that are using very light force in their adjustments, as in ounces of pressure to adjust the upper cervical spine vertebrae.