"I ran the whole marathon with my period blood running down my legs," the 26-year-old wrote of the April race on her website.
Gandhi, a Harvard Business School graduate, wrote that she got her period the night before the big race and thought that a tampon would be uncomfortable while she ran. But that isn't the only reason she decided to let it flow.
"I ran with blood dripping down my legs for sisters who don't have access to tampons and sisters who, despite cramping and pain, hide it away and pretend like it doesn't exist."
She added: "I ran to say, it does exist, and we overcome it every day."

Kiran Gandhi (right)
Courtesy Kiran Gandhi
"I felt kind of like, Yeah! F--- you!," she said. "I felt very empowered by that. I did."

Kiran Gandhi (center) and fellow runners
Courtesy Kiran Gandhi
Gandhi tells PEOPLE that she decided to run without a tampon to highlight the sentiment of period-shaming and the language surrounding women's menstrual cycles. She wrote on her site that "on the marathon course, sexism can be beaten."

Kiran Gandhi
Courtesy Kiran Gandhi












