where do tumors come from?

Tumors arise from the uncontrolled growth of cells that have undergone genetic mutations, leading to changes in their normal regulatory mechanisms. These mutations can result from various factors, including environmental influences like radiation and chemicals, inherited genetic predispositions, and viral infections. When the balance between cell division and cell death is disrupted, it can lead to the formation of a mass of abnormal cells, which may develop into a benign or malignant tumor.