As the winter months approach and people spend more time inside, hospitals might begin to see more and more cases of carbon monoxide poisoning.

Often, getting more tests and treatment for an illness is not better. In fact, it might actually lead to other problems. That's part of the reason CT scans aren't recommended for kids' headaches.

Some medications are linked to disorders such as autism or to birth defects when taken during pregnancy. However, that risk must also be balanced against the medication's benefits.