The probability of brain metastasis of squamous lung cancer is not high. Lung squamous carcinoma is a kind of non-small cell lung cancer, with the progress of disease, it is easy to spread directly or invade local adjacent tissues, but compared with adenocarcinoma and other primary lung cancers, it is not easy to have distant organ metastasis, so the probability of brain metastasis is relatively low, and there is no statistical data on the specific probability of metastasis. Although the probability of brain metastasis of squamous lung cancer is not high, there is a certain possibility. If brain metastasis occurs, with the increase of tumor volume, it will cause certain stimulation to the meninges, and it will cause the increase of intracranial pressure, and the patient will suffer from headache, vomiting and other symptoms. Patients with squamous lung cancer should cooperate with doctors to take treatment and have regular checkups, and observe the changes of body, and if brain symptoms occur, they should be alert to the possibility of brain metastasis and consult doctor in time.