There exists lower crossed syndrome and upper crossed syndrome.

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Muscle imbalance patterns across the spine and pelvis are recognized in chiropractic medicine as crossed syndromes. In upper crossed syndrome, the neck and shoulder region commonly shows tightness of the sternocleidomastoid and upper trapezius with tight pectoral muscles, paired with weakness of the deep cervical flexors and the lower trapezius/serratus anterior. This combination tends to pull the head forward and the shoulders forward, creating forward head posture and rounded shoulders. In lower crossed syndrome, the hip flexors and lumbar extensors become tight while the abdominals and gluteal muscles are weak, leading to anterior pelvic tilt and increased lumbar lordosis. These patterns can occur independently or together in the same person and are associated with characteristic postural changes and symptoms. Because these are well-described, established concepts in clinical practice, the assertion that they exist is accurate.