There are no symptoms and precursors in the early stage of lung cancer. Some lung cancers have the following symptoms and precursors in the early stage:

First, cough: it is the first symptom, generally irritating dry cough with little or no sputum;

Second, hemoptysis: or bloodshot sputum;

Third, chest pain: early symptoms are mild, mainly manifested as dull pain and dull pain. With the development of the disease, the tumor will cause persistent chest pain when it invades the pleura;

Fourth, fever: generally persistent low fever, but also high fever, mainly due to cancer tissue necrosis to absorb heat, anti-inflammatory treatment is generally ineffective, or repeated attacks after fever;

5. Other symptoms: chest tightness, dyspnea and hoarseness may occur.