From a modern medical perspective, the neck consists of seven bones known as the cervical vertebrae, and maintaining its natural C-shaped curve, cervical lordosis, is crucial. This curve disperses head weight, absorbs shock, and protects the pathways for blood and nerves traveling to the brain. However, some pillows that force a specific posture, such as certain pillows for forward head posture, can actually interfere with this natural curve if they do not match an individual's cervical curve or body shape.
For instance, an excessively high pillow bends the neck forward, reducing cervical lordosis or, in severe cases, inducing straight neck syndrome. Conversely, an excessively low pillow tilts the neck backward, which can induce excessive cervical kyphosis. Such improper postures keep multiple muscles around the neck tense throughout the night, including the trapezius muscle, sternocleidomastoid, and levator scapulae, while exerting abnormal mechanical stress on the ligaments and discs around the cervical vertebrae. Consequently, muscles shorten and blood flow is impeded, allowing fatigue substances like lactic acid to accumulate, which can trigger chronic neck pain, shoulder stiffness, and even headache.
Furthermore, if the nerve root emerging between the cervical vertebrae is compressed, numbness or pain can radiate to the shoulders, arms, and hands. If compression on structures around the cervical vertebrae persists throughout the night, it affects blood flow to the brain and the circulation of cerebrospinal fluid, disrupting deep sleep and triggering hyperactivation of the sympathetic nerve, which lowers sleep quality. During sleep, the parasympathetic nerve should dominate so the body can recover; when neck discomfort keeps the body in a state of tension, falling into deep sleep becomes difficult, ultimately leading to chronic fatigue and impaired concentration. Therefore, choosing a pillow that fits your body well is not merely a matter of sleeping comfort, but an essential factor in maintaining cervical health and the balance of the entire nervous system.
