How does poor mental health affect physical health long term?

Poor mental health can have significant long-term physical consequences through several interconnected pathways. Chronic stress, depression, and anxiety trigger prolonged release of cortisol and other stress hormones, which over time damage the cardiovascular system, weaken the immune response, and increase inflammation throughout the body. This raises the risk of heart disease, stroke, diabetes, and autoimmune conditions. People with persistent mental health struggles also tend to adopt unhealthy behaviors like poor sleep, physical inactivity, smoking, and overeating, which compound physical deterioration. Research consistently shows that individuals with serious mental illness die on average 10 to 20 years earlier than the general population. The mind-body connection is deeply biological, meaning untreated mental health conditions genuinely accelerate physical aging and disease progression.