The point of this stat: chronic stress tends to be “whole-body.” It often doesn’t stay neatly separated into either physical symptoms (like muscle tension, insomnia, high blood pressure) or psychological symptoms (like anxiety and feeling overwhelmed). It commonly becomes both.
Why this is hard to quantify: there isn’t a single, universal clinical measure that cleanly says what percentage of chronic-stress cases are physical vs. psychological. Many symptom lists overlap, and people experience different mixes over time. So “~70%” should be read as a directional summary—most people with chronic stress will notice effects in more than one domain, not as a precise epidemiological estimate.
What the evidence does support consistently is the underlying pattern: chronic activation of the stress response is linked to downstream changes across multiple systems (brain, cardiovascular, immune, endocrine), which is why symptoms can look so varied from person to person.
