Why Stress Makes Us Sick
Humans and zebras both have stress responses, but they use them in very different ways. A zebra is stressed when a lion attacks, and once the danger passes, its body settles down. Humans can trigger the same emergency system with thoughts alone, worrying about money, status, work, illness, or things that may never happen.
That difference matters because the stress response was built for short-term physical emergencies. It prepares the body to survive the next few minutes, not the next ten years. When that same system is turned on again and again by psychological strain, it begins to damage the body instead of protecting it.
Modern life has changed the kinds of diseases that shape our lives. In the past, many people died from infections. Now people often live long enough to develop slower illnesses such as heart disease, diabetes, immune problems, and some forms of depression, all of which can be made worse by chronic stress.
The body normally tries to stay in balance, keeping things like temperature, blood sugar, and fluid levels within a healthy range. Stress temporarily throws that balance aside in order to meet a challenge. That can save your life in a true emergency, but if this pattern becomes a daily habit, the wear and tear adds up. Sapolsky calls that long-term cost allostatic load, the price the body pays for staying on alert too often.
Stress does not act alone, and it does not explain every illness. But it can make existing vulnerabilities more dangerous and recovery more difficult. A person’s past experiences, social life, personality, and place in society all shape how often the stress response turns on and how hard it is to shut off.
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