Overview of esophageal obstructions

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The esophagus (the hollow tube that leads from the throat to the stomach) can be narrowed or completely obstructed (blocked).
In most cases, the cause is

Progression of an injury to the esophagus
Tumor growth
Food and foreign bodies

Injuries that can progress to obstruction can result from damage to the esophagus caused by the repeated backflow of acid from the stomach (gastroesophageal reflux or GERD), usually over years. Obstruction can also be caused by damage to the esophagus that occurs after swallowing a corrosive substance (erosive esophagitis) or rarely after inflammation of the esophagus caused by a pill that gets stuck in the esophagus for a period of time.
Tumors are serious causes of narrowing, including cancerous tumors and noncancerous tumors of the esophagus.
Narrowing may also occur when something presses against (compresses) the outside of the esophagus. Compression can result from a number of causes, such as

Enlargement of the left atrium of the heart
Aortic aneurysm
An abnormally formed blood vessel (dysphagia lusoria)
An abnormal thyroid gland
A bony outgrowth from the spine
Cancer (most commonly lung cancer)

Occasionally, the cause is hereditary (for example, lower esophageal rings or an esophageal web). These disorders usually cause only partial obstruction.
Because all these conditions decrease the diameter of the esophagus, people who have one of them usually have difficulty swallowing solid foods, particularly meat and bread. Difficulty in swallowing liquids develops much later, if at all.