Sasha Pieterse spoke candidly about her health journey, revealing the private struggle she endured while battling a number of symptoms at the same time she was starring on a hit TV show. "I started Pretty Little Liars when I was 12," Pieterse, 29, pointed out while chatting with cohosts Dr. Thaïs Aliabadi and Mary Alice Haney on the Tuesday, August 19, episode of the "SHE MD" podcast. "By 17, I had gained 70 pounds and was silently battling seizures, irregular periods, acne and hair loss, while playing an 'It Girl' on TV.