Well, this is part 4 from this article, and there’s more to come; you see why it’s taking me a while to get through it! Dr. Muscolino talked about 3 probable effect of upper crossed syndrome: the effect of thoracic outlet syndrome, negative effect on breathing, and negative effect on lumbar spine. Three probable effects from upper crossed syndrome are: pectoralis minor syndrome (caused by locked short pectoralis minor), costoclavicular syndrome (caused by collapsed posture of the clavicle against the 1st rib), and anterior scalene syndrome (caused by adaptive shortening of all parts of the scalene muscle). Upper crossed syndrome can cause negative effects on the lumbar, and cervical, spine because very often, compensation for a lack of range of motion in the thoracic area causes facet joint irritation, osteoarthritic degenerative changes (and possible foraminal encroachment and nerve impingement), and, naturally, low back pain. Low back pain (and cervical (neck) pain can, in turn, cause spasming of nearby musculature.