When you swallow a pill -- either prescription medication, an over-the-counter type or a vitamin formulation -- it can sometimes feel as though it is stuck in your throat.

A small flap of cartilage located in the throat, the epiglottis typically remains upright and allows air to pass freely into the larynx and lungs. When you swallow, however, the epiglottis inverts to cover the larynx and prevent liquids and foods from entering the airway and lungs.

The esophagus is the medical term for the swallowing tube, or tube that extends from the throat to the stomach. The esophagus is lined with rings of muscles called sphincters at the top and bottom of its length.

The esophagus is a hallow, distensible muscular tube 25 cm in length that runs from the pharynx to the stomach. Esophageal disorders run the gamut from highly lethal cancers to the merely annoying heartburn that may occur, for example, after a large, spicy meal.

Dysphagia is a condition characterized by difficulty chewing and swallowing and sometimes pain. People with dysphagia may be unable to swallow at all or may have difficulty swallowing liquids, solids or saliva. You may require a modified diet to help you meet your nutritional needs and prevent aspiration.