Smoking is the root of the disease and a risk factor. Small cell carcinoma and non-small cell carcinoma are the two classifications of lung cancer that are used to assess the illness prognosis and available treatments. Depending on the type of tumour and the number of metastases, several signs and symptoms can sometimes be present. The diagnostic strategy for a lung cancer examination involves tissue diagnosis, including cancer evaluation, and histologic diagnosis. Treatment and prognosis are based on the type and stages of the cancer. There are currently no early diagnosis or screening treatments for lung cancer. Therefore, quitting smoking continues to be an important part of primary care prevention.