Does stress cause cancer?

It is not clear whether stress causes cancer. Although chronic (long-term) stress can lead to many health problems, whether it is linked to cancer is uncertain.

Studies done so far have had varying results. Some have found an association between stress and certain cancers, while others have found no link. Because the findings do not agree, scientists cannot say that stress causes cancer.

Even when stress appears to be linked to cancer risk, the relationship could be indirect. People under chronic stress may take up unhealthy behaviors, such as smoking, overeating, being less active, or drinking alcohol, and these habits are themselves tied to a higher risk of some cancers.

What is clearer is that managing stress can help you feel better while living with cancer. Emotional and social support, physical activity, and, when needed, help from a mental health professional can all lower stress, anxiety, and low mood.