Why is a malignant tumor considered more dangerous than a benign tumor?

A malignant tumor is considered more dangerous than a benign tumor primarily because its cells have the ability to invade other tissues. This invasion allows malignant tumors to spread throughout the body, a process known as metastasis, where cancerous cells enter the bloodstream or lymphatic system and form secondary tumors in distant organs. This aggressive behavior contrasts with benign tumors, which remain localized and do not invade surrounding tissues; they usually grow at a slower rate and do not pose the same immediate threat to vital bodily functions.

The ability of malignant cells to invade neighboring tissues not only disrupts normal tissue architecture and function but also complicates treatment options, making management of malignant tumors more challenging. This invasiveness is a hallmark of cancer and is integral to their classification as malignant, signifying a more serious and potentially life-threatening condition.