We all know what cancer is: a category of diseases that involve abnormal cell growth that can spread to other parts of the body. Cancer can cause almost any symptom – it depends on the kind of cancer, its size and its stage.About 90.5 million people had cancer in the year 2015. And about 14.1 million new cases are detected each year. These statistics do not include skin cancer, apart from melanoma. For men, the most common types of cancers are lung cancer, prostate cancer, colorectal cancer and stomach cancer. For women, breast cancer, colorectal cancer, lung cancer and cervical cancer are the most common threats. The most common cancers that attack children are acute lymphoblastic leukemia and brain tumors. The older a person grows, the greater the risk of him or her getting cancer – that’s why rates of cancers are increasing, more people are living longer than ever before, especially in the developed world.