The thyroid gland is a small butterfly-shaped gland in the neck, just in front of the windpipe (trachea). One of its main functions is to produce hormones that help regulate the body's metabolism (the process that turns food into energy). These hormones are called triiodothyronine (T3) and thyroxine (T4). Many of the body's functions slow down when the thyroid doesn't produce enough of these hormones.
Esophageal spasm is a disorder of the rhythmic waves of muscular contractions (peristalsis) of the esophagus. The cause of this disorder is not known. Symptoms include chest pain and difficulty swallowing.
An esophageal spasm is a rare disorder characterized by abnormal muscle contractions in the esophagus, the narrow muscular organ that connects the mouth to the stomach and through which foods and liquids pass after being swallowed.here are two main types of spasms: 1  Diffuse (or distal) esophageal spasmsâThese are uncoordinated muscle contractions that occur throughout the lower two-thirds of the esophagus. 2  Nutcracker esophagus is a condition in which the muscle contractions are coordinated but are too strong, causing severe pain.