Esophageal cancer, also called esophageal cancer, can be identified according to patients’ clinical manifestations and auxiliary examinations, etc. A single symptom or examination result cannot explain the problem, and comprehensive judgment is needed, so there is no “simplest” way to identify it. Patients with esophageal cancer have atypical symptoms in the early stage, such as post-sternal discomfort, slow swallowing, etc. In the middle and late stage, they will have reflux, pain, difficulty in swallowing, etc. Usually, patients will undergo gastroscopy to check their gastrointestinal symptoms, which is the most effective way to identify the cancer. Generally, patients will undergo gastroscopy to observe the morphology of the lesion and take biopsy to confirm the diagnosis. Patients may also undergo barium esophagography to observe the lesion. In addition, patients will undergo CT, MRI, and ultrasound to determine if there are metastatic lesions. Generally speaking, endoscopic examination together with histopathological examination is the “gold standard” for diagnosing esophageal cancer, which can make a diagnosis of esophageal cancer. It is recommended that patients carry out corresponding examinations under the guidance of doctors in order to make clear diagnosis and formulate treatment plans.