A tumour is a mass or piece of tissue that may take after expanding. Not all tumors are carcinogenic, however it is a smart thought to see a specialist on the off chance that one appears.The National Cancer Institute characterize a tumor as "a strange mass of tissue that outcomes when cells separate more than they ought to or don't bite the dust when they should."In a sound body, cells develop, partition, and supplant each other in the body. As new cells structure, the old ones kick the bucket. At the point when an individual has malignant growth, new cells structure when the body needn't bother with them. On the off chance that there are an excessive number of new cells, a gathering of cells, or tumor, can create. Albeit a few tumors are amiable and comprise of noncancerous cells, others are dangerous. Dangerous tumors are destructive, and the cells can spread to different pieces of the body. A tumor is a mass of tissue that is shaped by a gathering of unusual cells. Typically, the phones in your body age, kick the bucket, and are supplanted by new cells. With disease and different tumors, something disturbs this cycle. Tumor cells develop, despite the fact that the body needn't bother with them, and not at all like ordinary old cells, they don't kick the bucket. As this procedure goes on, the tumor keeps on developing as an ever increasing number of cells are added to the mass. The precise reason for a benevolent tumor is regularly obscure. It creates when cells in the body separate and develop at an extreme rate. Normally, the body can adjust cell development and division. At the point when old or harmed cells pass on, they are consequently supplanted with new, solid cells. On account of tumors, dead cells remain and structure a development known as a tumor. Malignant growth cells develop in a similar way. Be that as it may, in contrast to the cells in kind tumors, carcinogenic cells can attack close by tissue and spread to different pieces of the body.