The Cortisol Connection: What Your Stress Hormones Reveal About Your Relationship A science-backed look at why connection is biology — and how couples counseling can change it. Picture the last argument you had with your partner. Not the words — the body. The tight chest, the heat in your face, the way sleep wouldn’t come. That sensation has a name and a chemistry: cortisol, the body’s primary stress hormone, released by the HPA axis whenever your brain decides something matt