Symptoms such as discomfort and foreign body sensation in the pharynx, sore throat, cough, blood in sputum, change in voice and difficulty in breathing may be suffering from laryngeal cancer. Patients with supraglottic type of laryngeal cancer may experience discomfort and foreign body sensation in the throat in the early stage. When the surface of cancer breaks down, patients may have mild throat pain. When the cancer ulcerates, there is blood in sputum and foul-smelling sputum is clucked out. When the tumor invades the vocal folds or the secretion from the ulceration is attached to the vocal folds, the patient may have voice change. In vocal type laryngeal cancer, the tumor can affect the vocal cords when it is very small, and hoarseness occurs. The stimulation of tumor and local secretion can cause cough. When the tumor grows to a certain size, it will block the vocal folds and cause difficulty in breathing. When appealing symptoms appear, it is recommended to go to the hospital in time to find out the cause and timely treatment.