Early stage esophageal cancer may be carcinoma in situ. Besides carcinoma in situ, some esophageal cancers that have not invaded the muscle layer also belong to early stage. Esophageal cancer will be staged according to the level of invasion of the primary tumor, local lymphatic situation and whether there is distant metastasis. Early stage esophageal cancer refers to carcinoma in situ confined to the mucosal layer and tumors invading the lamina propria, the muscularis mucosae, and the submucosa, but invading the muscularis mucosae of the esophagus, and there are no metastases to local lymph nodes and other distant sites. No matter it is any type of early esophageal cancer, it is necessary to pay attention to it in time and take systematic treatment under doctor’s guidance, so as not to delay or aggravate the condition.