There are no exact antonyms for Posterior Cervical Sympathetic Syndrome since it is a medical condition that affects the nervous system. However, some words that may be used in contrast to this condition include healthy, normal, and functioning, as Posterior Cervical Sympathetic Syndrome is characterized by an abnormal function of the sympathetic nervous system. Other terms that may be used in opposition to this condition would be pain-free, stable, or calm, as patients with this disorder often experience discomfort, irregular blood pressure, and other symptoms. Proper diagnosis and treatment can help manage the symptoms of Posterior Cervical Sympathetic Syndrome and improve overall health and well-being.