Early clinical manifestations of invasive squamous lung cancer may not be obvious, and some patients may have symptoms such as cough, fever, blood in sputum, etc. As the disease progresses, if squamous lung cancer is further infiltrated, symptoms such as chest pain and hoarseness may appear. 1. Cough: cough is a typical early symptom of squamous lung cancer, which may be accompanied by a small amount of sputum, mainly dry cough. 2. Fever: some patients may have fever due to obstructive pneumonia caused by necrosis of tumor tissues. 3. Blood in sputum: some patients may have the symptom of blood in sputum, which is usually caused by the growth of tumor into the lumen. 4. Chest pain: if the tumor invades the pleura or chest wall, chest pain may occur, and the nature of the pain is mostly vague or dull pain, which will be aggravated when coughing or breathing. 5. Hoarseness: if the tumor compresses the recurrent laryngeal nerve, it will lead to paralysis of the vocal cords, which will lead to the symptom of hoarseness. The specific symptoms of invasive squamous lung cancer vary from person to person, if there is any abnormality, it is recommended to go to the hospital for consultation in time.