A study at Harvard Medical School found that meditation lowered blood pressure by making the body less responsive to stress hormones, in a similar way to blood pressure-lowering medication. Meanwhile a British Medical Journal report found that patients trained how to relax had significantly lower blood pressure.
Stress leads to inflammation, a state linked to heart disease, arthritis, asthma and skin conditions such as psoriasis, say researchers at Emory University in the US. Relaxation can help prevent and treat such symptoms by switching off the stress response. In this way, one study at McGill University in Canada found that meditation clinically improved the symptoms of psoriasis.
The simple difference between those who meditate and those who do not, is that for a meditative mind the thought occurs but is witnessed, while for an ordinary mind, the thought occurs and is the boss. So in both minds, an upsetting thought can occur, but for those who meditate it is just another thought, which is seen as such and is allowed to blossom and die, while in the ordinary mind the thought instigates a storm which rages on and on.