Symptoms of radiation pneumonitis are not specific and usually present as cough, shortness of breath and low-grade fever. Radiation pneumonitis is an acute inflammatory reaction in the lungs caused by radiation, mostly due to lung tissue damage caused by radiation exposure. Symptoms are related to the dose of radiation received, treatment program, etc., and there is a relatively large individual variability. The clinical symptoms of radiation pneumonitis are not specific and are very similar to those of other types of pneumonia, tuberculosis, and tumors. Symptoms usually appear one to three months after irradiation and may gradually worsen. At the beginning, the symptoms include low-grade fever, cough, dry cough, occasional sputum, chest tightness, shortness of breath, etc. At the later stage, there may be coughing up blood, dyspnea, cyanosis, and even chronic hypoxia symptoms, such as pestle-shaped finger. If diagnosed with radiation pneumonia, it is important to consult a doctor in time, receive relevant examinations, and cooperate with the doctor to carry out scientific treatment.