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.
1 This condition produces multiple high-pressure, poorly coordinated contractions of your esophagus, usually after you swallow. 2  Diffuse spasm affects the involuntary muscles in the walls of your lower esophagus. 3  Esophageal stricture. 4  A narrowed esophagus (stricture) can trap large pieces of food.