There are two types of laryngeal cancer, primary and secondary. Primary laryngeal cancer refers to tumors whose primary site is in the larynx, and squamous cell carcinoma is the most common. Secondary laryngeal cancer refers to the metastasis of malignant tumors from other parts of the body to the larynx, which is less common. Symptoms of laryngeal cancer mainly include hoarseness, difficulty in breathing, cough, difficulty in swallowing, and metastasis of lymph nodes in the neck. High-risk groups should pay attention to quit smoking, drink alcohol appropriately and do preventive work. Early detection and early treatment are very important to reduce the harm of laryngeal cancer, which on one hand can improve the survival rate of patients after surgery, and on the other hand has the possibility to preserve the articulation function of larynx as much as possible and reduce postoperative complications. 1.Cause of laryngeal cancer: Laryngeal cancer is most often caused by prolonged smoking, and the incidence of laryngeal cancer is significantly higher in people who smoke or drink alcohol regularly. 2.Symptoms of laryngeal cancer: Typical symptoms of laryngeal cancer include hoarseness, sore throat, earache, difficulty in breathing or coughing with blood in sputum. A lump in the neck is also a common symptom of laryngeal cancer. Although these symptoms can also appear in other unimportant diseases, if they occur, they should still go to hospital for detailed examination to rule out the possibility of laryngeal cancer. 3.How to diagnose laryngeal cancer? The diagnosis of laryngeal cancer depends on careful laryngeal examination, firstly, detailed medical history should be taken, then indirect laryngoscopy of larynx should be performed, and for patients with unclear larynx, fiberoptic laryngoscopy should also be performed, which is a fiberoptic catheter with light source through nasal or oral cavity. The pathologist will issue a pathology report in 3-5 days to determine whether it is laryngeal cancer.