Tumor Defined: The Different Types and How They Form
A tumor, or neoplasm, is abnormal tissue that develops because of excessive cell growth. Illustration by Julie Bang for Verywell Health When Is a Tumor Cancer? All tumors are triggered by abnormal, often excessive, cell growth. Illustration by Julie Bang for Verywell Health This is part of a process known asmetastasis, and its what makes cancer so dangerous. It’s typical for cancerous tumors break through the tissue from which they originate and invade other areas....