Cancer is relatively uncommon in younger age group and the risk increases with increasing age. Tumors, which occur in children, are Wilms' tumor of the kidney and Nerve tissue cancer. Cancers of the lung, gastric system and prostate gland become more common with increasing age. Cancer of the breast can occur at any age, but generally occurs after the age of 30 years. Certain cancers are more common in men because of their habits.
Many cancers predominantly occur in one sex for no apparent reason.
Certain cancers are found to be more common in a particular geographical location. This may also be due to associated factor of climate race and habits of people residing in that location. Many cancers occur in tissues, which have undergone an abnormal change. Similarly melanoma may arise in a pre existing mole or dark pigmented spot. Online Shopping Auto Junction Chronic irritation of the lining of mouth and throat due to cigarette smoke, habit of chewing paan. , gutka, paan masala predispose to cancer.