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 spasms can feel like sudden, severe chest pain that lasts from a few minutes to hours. Esophageal spasms typically occur only occasionally and might not need treatment. But sometimes the spasms are frequent and can prevent food and liquids from traveling through the esophagus. If esophageal spasms interfere with your ability to eat or drink, treatments are available. Symptoms.