Cancer is a disease in which some of the body’s cells grow uncontrollably and spread to other parts of the body.
Cancer can start almost anywhere in the human body, which is made up of trillions of cells. Normally, human cells grow and multiply to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place.
Most Common Types of Cancer
4-Non-melanoma and melanoma(Skin cancer)
What causes cancer?
Cancer arises from the transformation of normal cells into tumour cells in a multi-stage process that generally progresses from a pre-cancerous lesion to a malignant tumour. These changes are the result of the interaction between a person’s genetic factors and three categories of external agents, including.
1-physical carcinogen(ultraviolet and ionizing radiation).
2-chemical carcinogens( tobacco smoke, food contaminant, water contaminant).
3-Biological carcinogens(viruses, bacteria, or parasites).