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.
Esophageal spasm is a sudden, painful tightening of your lower esophagus. Your esophagus is the tube that food and liquids pass through from your mouth to your stomach. The cause of esophageal spasm is not clear. It may be caused by problems with the nerves that control how your esophagus moves when you swallow . Esophageal spasm may be common among family members. Foods that are too hot or too cold may increase how often your esophagus spasms. Spasms may also happen on their own.