Everyone’s heard these medical myths, and your mom (and maybe even your doctor!) may have been guilty of spreading a few of them: High blood pressure causes headaches. High blood pressure usually has no symptoms. Neither does it cause dizziness, although dizziness is a common side effect of treatments for high blood pressure. Women should examine their breasts. Research shows that routine breast self-examinations aren’t sensitive enough to detect many lumps, and may subject women to increased anxiety. It’s dangerous to mix alcohol and antibiotics. Alcohol doesn’t interact with antibiotics. Metronidazole (Flagyl) is an exception, however, and can cause vomiting....