7 Most Controversial Medical Theories Proven True

medical theoriesVery often different theories and studies cause strife in scientific circles, but sometimes even the most unbelievable of them ultimately prove true. See these 7 most controversial theories that were eventually proven true:

1. Air pollution causes lung cancer

Since 1939, many scientists have argued that cancer is mainly caused by various factors such as air pollution. It took 21 years to confirm this theory.

2. Bacteria cause ulcers

In 1982, doctors Robin Warren and Barry Marshall from Australia associated the bacteria «Helicobacter pylori» with the ulcer, but the medical community argued that the cause of the condition was stress in combination with specific food choices. However, in mid 1990s, the American Institute of Health confirmed their theory.

3. The aspirin reduces the risk of heart attack

In 1950, Lawrence Craven from California published his first research which showed that the effect of aspirin prevents the blood clots that cause heart disease. About 40 years later, the prescription of one aspirin a day to patients with heart disease was adopted.

4. X-rays are harmful

A study of 1911 linked the X-rays to leukemia and other cancers, but the widespread use of the rays … read more

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