Since people stand on two feet, they need to use their muscles for a long time to erect the flexible spine, balance the body and fight against the gravity. This is the real cause of poor posture and common muscle and joint neuralgia. The human being is able to stand up and move because of his balance system; this system has three parts: input, processing and output. The sensations from the eyes, inner ear, soles of the feet and neck provide a set of real-time data to the central nervous system to calculate the position of each body part in this space. The central nervous system sends signals to regulate muscle tone in real time to maintain body balance and posture in the most efficient way. The effects of balance disorders are postural problems, muscle strain, joint degeneration, body imbalance and common pains. It is clear that the cause of common pain is a disruption of sensory signals, which is a neurological problem, not a purely mechanical one. This medical problem is called postural and balance disorder or simply postural syndrome. This basic science-based discipline is postural medicine. Upper Cervical Misalignment and Postural Syndrome The upper cervical spine supports the entire head and is in a critical position. From the perspective of postural medicine, because the eyes and inner ear are located in the skull, the relative position of the head and neck directly affects the brain’s analysis of signals from the eyes and inner ear; moreover, because the center of gravity is changed, it affects the sensation of pressure distribution on the soles of the feet. Therefore, it is believed that the misalignment of the upper cervical spine is the most common and important cause of postural syndrome, but the influence of the eyes, inner ear and feet on this syndrome should never be ignored. Since people stand on two feet, they need to use their muscles for a long time to erect the flexible spine, balance the body and fight against the gravitational force. This is the real cause of poor posture and common muscle and joint neuralgia. The human being is able to stand up and move because of his balance system; this system has three parts: input, processing and output. The sensations from the eyes, inner ear, soles of the feet and neck provide a set of real-time data to the central nervous system to calculate the position of the body parts in this space. The central nervous system sends signals to regulate muscle tone in real time to maintain body balance and posture in the most efficient way. The effects of balance disorders are postural problems, muscle strain, joint degeneration, body imbalance and common pains. It is clear that the cause of common pain is a disruption of sensory signals, which is a neurological problem, not a purely mechanical one. This medical problem is called postural and balance disorder or simply postural syndrome. This basic science-based discipline is postural medicine. Upper Cervical Misalignment and Postural Syndrome The upper cervical spine supports the entire head and is in a critical position. From the perspective of postural medicine, because the eyes and inner ear are located in the skull, the relative position of the head and neck directly affects the brain’s analysis of signals from the eyes and inner ear; moreover, because the center of gravity is changed, it affects the sensation of pressure distribution on the soles of the feet. Therefore, it is believed that misalignment of the upper cervical spine is the most common and important cause of postural syndrome, but the influence of the eyes, inner ear and feet on this syndrome should never be ignored.