-
Now Playing: Viral Facebook video captures a 4-year-old suffering paralysis from a tick bite
-
Now Playing: Diseases from mosquito, flea and tick bites have tripled in last 13 years: CDC
-
Now Playing: Urgent warning as experts brace for one of the worst tick seasons
-
Now Playing: What is tick paralysis?
-
Now Playing: The ultimate summer workout to get beach body ready
-
Now Playing: Encouraging new research in the fight against breast cancer
-
Now Playing: How probiotics and protein powders can help your skin
-
Now Playing: Kelly Clarkson explains recent weight loss
-
Now Playing: How Kate Spade's tragic death is shedding light on depression, suicide
-
Now Playing: Non-drinkers, heavy drinkers miss more work: Study
-
Now Playing: How collagen and adaptogens can help your skin
-
Now Playing: Kate Spade's death shines light on suicide
-
Now Playing: What is PTSD?
-
Now Playing: Woman who appeared on HGTV finds out she has cancer after viewer spots lump
-
Now Playing: Doctor viewing HGTV's 'Beachfront Bargain Hunt' spots possible thyroid cancer on part
-
Now Playing: Women with the most common kind of breast cancer can skip chemotherapy: Study
-
Now Playing: Chemo may not be necessary for breast cancer patients: Study
-
Now Playing: Nearly 70 percent of early breast cancer patients may not need chemotherapy: Study
-
Now Playing: Teen's intense workout may have led to potentially fatal condition
-
Now Playing: What is the deadly Nipah virus?