Esophageal cancer is not contagious, and the occurrence of esophageal cancer is related to the following factors:1. Carcinogenic substances: the most common one is nitrosamine, which is a class of strong carcinogens.2. Fungal infections: fungal infections can also induce esophageal cancer.3. Nutrition and dietary habits: it is generally believed that intake of more animal proteins, and less vitamin C, vitamin B2 and fresh vegetables are the nutritional features of the world’s high incidence areas of esophageal cancer, including frequent hot drinks and hard food, which can also easily lead to high incidence of esophageal cancer. Including frequent hot drinks, drinking high level of spirits, hard food, together with poor oral hygiene and missing teeth, can increase the mechanical damage of esophagus, which is also easy to lead to the high incidence of esophageal cancer.4. Stimulation of ethanol and tobacco: Especially tobacco, smoking all kinds of tobacco, including cigarettes, pipes, cigars and so on, are the risk factors for the occurrence of squamous carcinoma.5. Other esophageal diseases related to esophageal cancer: Including esophagitis, achalasia, esophageal Other esophageal diseases related to esophageal cancer: including esophagitis, achalasia, esophageal stenosis and human papillomavirus infection, all of which are closely related to esophageal cancer. The above factors have nothing to do with infectiousness, so esophageal cancer is not contagious.