A tumor is an abnormal growth of cells in the body. Tumors can be benign, meaning they are not cancerous, or malignant, meaning they are cancerous. Benign tumors do not typically spread to other parts of the body and are not life-threatening. Malignant tumors, on the other hand, can invade surrounding tissue and spread to other parts of the body, which can be life-threatening.

There are many different types of tumors, each with their own set of symptoms and treatment options. Treatment options may include surgery, radiation therapy, and chemotherapy. In some cases, observation and monitoring may be recommended if the tumor is benign or if the person is not a good candidate for treatment.