Does psychology have the same potential as a healing art as physiology has?
placebo effect is real
Positive outlook is pretty well-regarded as a factor in cancer treatments, too. Decent doctors know that they are not treating "a disease" or "a condition", but a real patient, and they make an effort to involve the patient in their own treatment. Empowerment (as opposed to helpless passivity) may not save a patient's life, but it can make the remainder of their life more comfortable and enjoyable.
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