Self-screening for esophageal cancer mainly focuses on whether one has been exposed to cancer-causing factors and whether one has clinical symptoms. 1. Regarding cancer-causing factors, we should consider whether we have been exposed to cancer-causing factors for a long time. Common cancer-causing factors include long-term smoking and alcoholism, long-term consumption of preserved products, high-salt diet, long-term deficiency of certain nutrients or vitamins, bad dietary habits such as overheating and overcooking, as well as having relatives suffering from esophageal cancer or other cancers in the family. 2. Clinical manifestations of esophageal cancer, early esophageal cancer patients have inconspicuous symptoms, and occasionally they may have discomfort after swallowing rough food, such as burning sensation behind the sternum, pins and needles itching sensation or pulling sensation. Slow passage of food or choking sensation is relieved after drinking water. Typical symptoms in the middle and late stages are progressive dysphagia, starting with solid food dysphagia, followed by fluid and finally liquid dysphagia. In addition to this, the patient will also have systemic manifestations such as gradual weight loss, fatigue, dehydration and so on. If you have been exposed to the above cancer-causing factors for a long time or have the above symptoms, consult a doctor promptly and take active treatment.