People who engage in physical activity after being diagnosed with cancer have a 35% lower risk of dying from their cancer, especially those with breast or prostate cancer.

What we’ve found so far suggests that physical activity after a cancer diagnosis may be linked to a lower risk of dying from cancer, particularly for those with breast or prostate cancer. We reviewed one assertion based on two studies, and both support the idea that people who stay active after diagnosis have a 35% lower risk of cancer-related death compared to those who are less active [1]. The evidence we’ve reviewed doesn’t show why this might be, or whether activity directly influences cancer progression. It also doesn’t tell us what type, amount, or intensity of activity matters most. We don’t know if the benefit applies equally to all cancer types, since the data focuses mainly on breast and prostate cancer. No studies in our review contradicted this finding, but the total number of studies analyzed is very small. Our current analysis shows a pattern, but it’s based on limited data. We can’t say activity causes lower cancer mortality, nor can we rule out other factors like overall health, diet, or access to care that might also play a role. The link is consistent across the studies we’ve seen, but more research is needed to understand how and for whom this connection holds true. For now, if someone has been diagnosed with cancer and is cleared by their doctor, staying physically active — even with light walking or gentle movement — may be one way to support their health. It’s not a treatment, but it could be part of a broader approach to well-being.