Early symptoms of lung cancer with 4mm lung nodule include cough and sputum, etc. Some patients may also have no obvious clinical manifestations. Some patients with 4mm lung cancer may have no obvious clinical symptoms in the early stage, and they will have obvious symptoms only after the disease progresses further. However, some lung cancer patients may have cough and sputum in the early stage, and the cough is mostly irritating dry cough. With the progress of the disease, there may be hemoptysis, dyspnea, fever, fatigue, weight loss, anemia, etc. If the tumor involves the recurrent laryngeal nerves, it may lead to hoarseness, and the tumor compresses the esophagus, which may lead to swallowing difficulty. Patients with lung nodule 4mm who present with suspected early symptoms of lung cancer are recommended to go to the hospital and ask the doctor to make a judgment.