Fish spines in the lungs may cause symptoms such as coughing, coughing up phlegm, and difficulty breathing. If a fishbone enters the lungs along the respiratory tract while eating fish, the lungs will react with stress as the fishbone is a foreign body, and the first symptom will be coughing and the need to expel the foreign body, and some small fish spines may be expelled through coughing. If the fishbone stays in the lungs for a long time, it may cause infection, which is not only manifested by coughing, but also accompanied by fever and yellow sputum. If the fishbone is stuck in a special location or causes a serious lung infection, the patient may also have difficulty breathing. If you have the above symptoms, you should consult a doctor in time, and cooperate with the doctor to take lung CT, X-ray and other tests to determine whether there is a fishbone, so as to target treatment.