Medical care can diagnose illness and injury, but a lack of medical care is not the cause of illness or injury. Medicine is more an art than a science. State-of-the-art care changes over time. When I was in medical school in 1972, a professor of medicine began his lecture by informing us that, "In 10 years' time you will discover that half of what I am telling you is wrong. I just don't know which half."
We didn't give aspirin to someone having a heart attack until after 1980, but it's now routinely administered even before the victim gets to the hospital. Until the 2000s, post-menopausal women were given estrogen to replace the hormones they no longer produced, with one study finding slight gains in life expectancy from the use of that therapy. Most now consider this practice to be harmful.
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