Acute stress, or more precisely certain ways
of reacting to
stress, can affect or in some
cases even cause the onset
of diabetes, arthritis, asthma, the common cold, herpes, AIDS and cancer (Locke & Colligan 1986).
However, other studies in mice with breast cancer show that once cancer has already been initiated,
stress can lead to increased rates
of tumor spread and metastases.26 Similarly, when mice were injected with leukemic cells and
stressed physically and physiologically with injections
of adrenaline, cancer progression occurred.27 Some scientists even propose that, while necessary in many
cases of cancer, undergoing surgery may cause enough
stress to lead to tumor promotion and progression.28 Therefore, it seems like
acute stress may help fight cancer, chronic
stress may help cause it, but once cancer is present, both
acute and chronic
stress may lead to cancer progression.