The placebo effect
The placebo effect explains how our mind and body works hand in hand.
As explained by Jeremy Dean Phd. Psychology. Perhaps you’ve had the experience that a headache improves seconds after you take an aspirin? This can’t be the drug because it takes at least 15 minutes to kick in.
Your mind knows you’ve taken a pill, so you feel better. In medicine it seems strongest in the case of pain: some studies suggest a placebo of saline (salty water) can be as powerful as morphine.