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.
Normally, contractions of the esophagus (the tube that connects the mouth and the stomach) move food from the mouth to the stomach with a regular, coordinated rhythm. Esophageal spasm means that contractions of the esophagus are irregular, uncoordinated, and sometimes powerful.hese contractions move food through the esophagus but can cause severe pain. Esophageal spasm is not common. Often, symptoms that may suggest esophageal spasm are the result of another condition such as gastroesophageal reflux disease (GERD) or achalasia.