-
Now Playing: Majority of people with dangerously high cholesterol not taking medication
-
Now Playing: How to lower blood pressure without medication
-
Now Playing: Dramatic rise in ADHD medication mishaps among kids and teens, report finds
-
Now Playing: What is cancer?
-
Now Playing: Inside Cigna's Health Improvement Tour van
-
Now Playing: Alyssa Milano on struggling with anxiety
-
Now Playing: FDA approves preventative treatment for migraines
-
Now Playing: Young American smokers get half of their smoke through hookahs: Study
-
Now Playing: Ohio teacher to donate kidney to 10-year-old girl
-
Now Playing: Should we be concerned with second-hand pot smoke, especially around children?
-
Now Playing: Could a PG-15 rating be coming to a theater near you?
-
Now Playing: Guys' guide to getting in shape for a wedding
-
Now Playing: First lady Melania Trump undergoes kidney surgery at Walter Reed
-
Now Playing: What is Ebola?
-
Now Playing: Women may not be getting enough information about heart disease, AHA warns
-
Now Playing: Inside the #GainingWeightIsCool fitness trend
-
Now Playing: Consumer Reports ranks the best sunscreens ahead of summer
-
Now Playing: 29 states now affected by E.coli romaine lettuce outbreak: CDC
-
Now Playing: Weight training can help shape the body and also the mind, studies show
-
Now Playing: New recommendations for prostate cancer screening