Causes

It's not exactly clear what causes esophageal cancer.

Esophageal cancer occurs when cells in the esophagus develop changes (mutations) in their DNA. The changes make cells grow and divide out of control. The accumulating abnormal cells form a tumor in the esophagus that can grow to invade nearby structures and spread to other parts of the body.

Types of esophageal cancer

Esophageal cancer is classified according to the type of cells that are involved. The type of esophageal cancer you have helps determine your treatment options. Types of esophageal cancer include:

• Adenocarcinoma. Adenocarcinoma begins in the cells of mucus-secreting glands in the esophagus. Adenocarcinoma occurs most often in the lower portion of the esophagus. Adenocarcinoma is the most common form of esophageal cancer in the United States, and it affects primarily white men.
• Squamous cell carcinoma. The squamous cells are flat, thin cells that line the surface of the esophagus. Squamous cell carcinoma occurs most often in the upper and middle portions of the esophagus. Squamous cell carcinoma is the most prevalent esophageal cancer worldwide.
• Other rare types. Some rare forms of esophageal cancer include small cell carcinoma, sarcoma, lymphoma, melanoma and choriocarcinoma.