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Lung cancer starts in the cells of the lung. A cancerous (malignant) tumour is a group of cancer cells that can grow into and destroy nearby tissue. It can also spread (metastasize) to other parts of the body. When cancer starts in lung cells, it is called primary lung cancer. The lung is part of the respiratory system. You use your lungs when you breathe. The lungs are in the chest, one on each side of the heart. The right lung has 3 main parts, called lobes. The left lung is a bit smaller and has 2 lobes. The lungs are cushioned and protected by a thin covering called the pleura. Cells in the lung sometimes change and no longer grow or behave normally. These changes may lead to non-cancerous (benign) tumours such as hamartoma and papilloma. But in some cases, changes to lung cells can cause cancer. Lung cancers are divided into non–small cell lung cancer and small cell lung cancer based on the type of cell in which the cancer started. 1. Non–small cell lung cancer: usually starts in glandular cells on the outer part of the lung. This type of cancer is called adenocarcinoma. Non–small cell lung cancer can also start in flat, thin cells called squamous cells. These cells line the bronchi, which are the large airways that branch off from the windpipe (trachea) into the lungs. This type of cancer is called squamous cell carcinoma of the lung. Large cell carcinoma is another type of non–small cell lung cancer, but it is less common. There are also several rare types of non–small cell lung cancer. These include sarcoma and sarcomatoid carcinoma. 2. Small cell lung cancer :

Brain cancer is an overgrowth of cells in your brain that forms masses called tumors. Cancerous, or malignant, brain tumors tend to grow very quickly. They disrupt the way your body works, and this can be life-threatening. However, brain cancer is quite uncommon Primary brain cancer develops from cells within the brain. Part of the central nervous system (CNS), the brain is the control center for vital functions of the body, including speech, movement, thoughts, feelings, memory, vision, hearing and more. Common brain cancer symptoms include:- 1. Headaches that are usually worse in the morning 2. Nausea 3. Vomiting 4. A lack of coordination 5. A lack of balance 6. Difficulty walking 7. Memory lapses 8. Difficulty thinking 9. Speech problems 10. Vision problems 11. Personality changes 12. Abnormal eye movements 13. Muscle jerking Cancer is named based on where in your body it begins. Brain cancer begins in your brain. This is sometimes referred to as primary brain cancer. You can also have cancer that has spread to your brain after starting somewhere else in your body. This is called metastatic brain cancer. Cancerous tumors in the brain are typically metastatic and not due to primary brain cancer.