With the arrival of environmental pollution and aging society, the incidence of lung cancer is increasing. Effective treatment of lung cancer is based on early detection. Lung cancer is not scary and some early lung cancers can be cured. But how can lung cancer be detected early? For us in daily life, it is not possible to go to hospital for physical examination every few months to reject whether there is lung cancer or not. However, there are some symptoms of lung cancer that need to be taken seriously and actively further examined. What are the symptoms of lung cancer? The most common manifestation of lung cancer is coughing, coughing sputum, sputum with blood or blood spots. The cough is mostly irritating and dry, and the cough persists, and some of them may be misdiagnosed as cold and delay the diagnosis. Some lung cancer patients may have chest tightness and shortness of breath. What are the clinical manifestations of atypical lung cancer? 1.Some lung cancers may invade nerves in the chest, such as phrenic nerve, causing ipsilateral diaphragm paralysis. 2.Tumor invades the recurrent laryngeal nerve, causing hoarseness. 3.Tumor invades superior vena cava, causing swelling of head, face and upper limbs. 4.Invasion of pleura may cause chest pain and chest tightness. 5.A few cases of lung cancer may invade the nerves of neck, shoulder and arm, causing numbness and pain of upper limbs, ipsilateral eyelid drooping, pupil narrowing and no sweating on the face. 6.In some cases, the endocrine substances that can be produced by the tumor can cause systemic symptoms, but not systemic metastasis of the tumor. For example, osteoarthropathy of pulmonary origin: pestle and mortar finger, painful bone and joint swelling, periosteal hyperplasia, etc. There are also some manifestations of Cushing’s syndrome: full moon face, buffalo back; severe muscle weakness; or male breast enlargement and other symptoms. These symptoms may disappear rapidly after the removal of lung cancer. Therefore, there are various manifestations of lung cancer, which must be paid enough attention to avoid misdiagnosis and miss the best time for treatment and regret.