Corn grain foci is an examination result of lung imaging system, which may be an early symptom of lung cancer, or it may be caused by pneumonia, tuberculosis and other diseases. The test result of cornu foci is not able to determine whether it is an early symptom of lung cancer or not, and it needs to be further carried out with other auxiliary tests and combined with the clinical symptoms in order to make a clear diagnosis and take active treatment measures. If it is caused by pneumonia, it is necessary to choose sensitive antibiotic treatment in time; if it is tuberculosis, it is necessary to choose anti-tuberculosis drugs in time; if it is lung cancer, it is necessary to take surgical treatment in time and according to the pathological results, it is necessary to carry out radiotherapy, chemotherapy and other therapeutic programs. We should go to regular hospitals as soon as possible for auxiliary examination, clear diagnosis, and active treatment for the cause.