Patients who feel a thorn in their throat belong to a foreign body feeling in the throat, and there are very many reasons for this symptom, as follows: I. Foreign body: It may be caused by a foreign body that does exist in the throat, and fish spines are a relatively common foreign body. Second, inflammatory reaction: some patients are caused by inflammatory reaction, such as chronic pharyngitis, chronic laryngitis, chronic tonsillitis. Lymphatic follicular hyperplasia: Some patients are caused by lymphatic follicular hyperplasia in the pharynx. Ulcers: Some patients are caused by mucosal ulcers in the oral pharynx. V. Malignant tumor: A small number of patients are caused by malignant tumors, such as laryngeal cancer and hypopharyngeal cancer. After this condition, patients are recommended to visit the ENT department, where laryngoscopy and routine blood tests can be done to help determine the condition initially. Some patients need to be treated with surgery and some patients need to be treated with medication.