For various reasons outlined in esophageal cancer

Esophageal cancer occurs in the epithelial tissue of esophageal cancer, accounting for 2% of all malignant tumors. The world every year about 200,000 people die of esophageal cancer, China is
High incidence area of esophageal cancer, esophageal cancer deaths due to gastric cancer in second place after the onset age in more than 40 years old and above, more men than women. But in recent years, under 40 years of age
Incidence have growth trend. And the occurrence of esophageal cancer nitrosamines chronic stimulation, inflammation and trauma, genetic factors, as well as drinking water, grain and vegetables in the Trace Elements
Content. However, the exact reasons unclear, pending study.