RN here: people with cancer are often very sick. They look like they are starving to death , muscles wasted away. There are a couple of causes of death that are common to many cancers. One is blood clots. That can be a heart attack , stroke or pulmonary embolism. Another is liver failure. Infection is also common for example with cancer of the digestive system. And it the cancer get into the brain it kills you by putting pressure on important structures or killings cells.
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