Indicators of lung cancer examination include physical examination, auxiliary examination (such as laboratory examination, imaging examination), endoscopy, pathological histologic examination and so on. 1. Physical examination: extrapulmonary signs may include pestle-like fingers (toes), non-wandering joint pain or dermatomyositis, ataxia and phlebitis. If lung cancer is suspected, if upper vena cava obstruction syndrome, vocal cord paralysis, Horner’s syndrome, etc. are found, there is a possibility of local invasion and metastasis. If there is hepatomegaly with nodules, enlarged lymph nodes in supraclavicular fossa, subcutaneous nodules, etc., there is the possibility of distant metastasis. 2. Auxiliary examination: (1) Laboratory tests: such as blood routine, liver and kidney function, coagulation function, etc. to assess the general condition. Serological tumor markers such as carcinoembryonic antigen, neuron-specific enolase, cytokeratin 19 fragment, etc., combined examination can improve the sensitivity and specificity of the examination. (2) Imaging examination: including X-ray chest radiography, MRI, ultrasound, CT, PET, etc., which can help in diagnosis, differential diagnosis, disease staging, assessment of surgical feasibility, and even monitoring of therapeutic efficacy and assessment of prognosis. 3. Endoscopy and other examinations: bronchoscopy and ultrasonic bronchocentesis biopsy, mediastinoscopy, thoracoscopy or open lung biopsy, sputum exfoliative cytology, etc. 4. Pathological and histological examination: biopsy tissue specimen for lung cancer pathological diagnosis mainly specifies the presence or absence of tumor and tumor type. Those who are suspected of lung cancer need to be examined in time and treated actively under the guidance of doctors.