A girl in TikTok, while running, says that "she is so bad with physical activity that she can taste her blood" while running. 

The video was answered by a doctor from Miami to confirm that yes, something like this could happen, as well as to explain the reasons.

According to Fayez (@lifeofadoctor), the experience is easily explained, however, it sounds strange, even though it is basically a common reaction.

He explains that if it does, blood comes from your lungs, as "small blood pockets in the lungs can explode when blood pressure rises".

The video has over 24 million views and dozens of comments, where users seem shocked by the scientific discovery. Fayez points out that "the amount of blood is very very small and is not a reason to stop exercising."

To reinforce the theory, another researcher at the Norwegian University of Science and Technology, Henning Ofstad Ness, says:

"The taste of blood usually occurs when you engage in high-intensity exercise. It raises your heart rate and raises your blood pressure. It's not something to worry about."

Source: Unilad, Science Norway