High blood pressure affects nearly half of all adults in the United States, and most of them are told the same thing: take this medication, reduce your sodium, exercise more. That advice is not wrong. But for a meaningful number of people, there is a structural factor contributing to their hypertension that no cardiologist, internist, or pharmacist has ever examined. It sits at the very top of the neck.
What Blood Pressure Actually Is and Why It Goes Wrong
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Blood pressure is the force exerted by blood against the walls of your arteries as the heart pumps. When that force stays consistently elevated, it damages the arterial lining, strains the heart, and increases risk for stroke, kidney disease, and heart failure. About 116 million Americans live with hypertension, and it is estimated that only about one in four has it under adequate control.
The standard explanation involves diet, stress, genetics, weight, inactivity, and age. All of these factors are real. But the regulation of blood pressure is ultimately a neurological function. The cardiovascular control centers in the brainstem, specifically the nucleus tractus solitarius and the rostral ventrolateral medulla, are responsible for adjusting heart rate, arterial tone, and blood volume on a moment-to-moment basis. If the brainstem is under mechanical stress, those control centers may not function optimally, and blood pressure can rise without any dietary or lifestyle explanation.
How the Atlas Affects Cardiovascular Function
The atlas vertebra sits directly beneath the skull, encircling the lower portion of the brainstem. Unlike all other vertebrae in the spine, it has no interlocking facet joints and no intervertebral disc above it. It is held in place entirely by muscles and ligaments, which makes it uniquely vulnerable to displacement from trauma.
When the atlas shifts, it can affect cardiovascular regulation through at least two pathways. First, it creates mechanical irritation to the brainstem, which houses the cardiovascular control centers. Even subtle pressure on these centers can alter the signals governing arterial tone and heart rate.
Second, the vertebral arteries, which supply blood to the brain and brainstem, pass through small openings in the cervical vertebrae called transverse foramina. A positional change in the atlas can alter the geometry of this pathway, affecting blood flow dynamics and potentially contributing to elevated vascular resistance.
This does not mean that every case of high blood pressure is caused by an atlas misalignment. It means that the atlas is a structural variable that should be evaluated, especially in patients whose hypertension has not responded fully to medication or lifestyle changes.
What Happens During an Upper Cervical Evaluation at UC Spine Care
At UC Spine Care, Dr. Cecilia Park use the Blair Upper Cervical technique, which begins with CBCT 3D imaging of the craniocervical junction. CBCT produces a volumetric scan that reveals the exact position of the atlas and axis relative to the skull, capturing misalignment patterns that flat-plane X-rays miss.
From this imaging, the doctors determine the precise angle, direction, and magnitude of any displacement. The correction is then engineered to match each patient's individual anatomy. No two atlas misalignments are the same, and no two corrections should be either.
The adjustment itself involves no twisting of the neck, no cracking sound, and no rapid thrust. It is a controlled, low-force input delivered at a specific contact point on the atlas. Most patients describe it as remarkably gentle. Infrared thermography is used at each visit to assess nervous system function and determine whether a correction is needed. If the atlas is holding its position, no adjustment is made.
Does This Mean You Can Stop Blood Pressure Medication?
That is a decision that should only be made in coordination with the physician prescribing the medication. Upper cervical care is not a replacement for medical management of hypertension. But it can be a powerful complement to it. Some patients find that their blood pressure stabilizes enough after correction that their prescribing physician is comfortable reducing dosage. Others find that medication that was previously ineffective starts working better once the brainstem is no longer under structural stress.
The point is not to choose between medication and chiropractic care. The point is to make sure every relevant factor has been evaluated, and for most hypertensive patients, the atlas vertebra has never been looked at.
Who Should Consider This Evaluation
If you live in Los Angeles, Koreatown, Mid-Wilshire, or the greater LA area or the surrounding communities, and you are managing high blood pressure with medication that has not fully controlled it, or if you prefer to explore drug-free approaches alongside your medical care, the upper cervical spine is worth investigating. This is especially true if you have a history of any head or neck trauma.
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