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Metastasis is when tumors spread beyond their original location, invading other parts of the body and generating secondary tumors, a characteristic that gives it the adjective malignancy. This process is one of the criteria taken into account to diagnose cancer and is related to a very significant increase in the probability of dying from the disease. In this article we will describe what metastasis is and what the symptoms of the 4 most common types are: lung metastasis, bone metastasis, hepatic metastasis (liver metastasis) and brain metastasis. We will also talk about other relevant characteristics, such as incidence, relationship with certain types of cancer or the risk of death they entail.