There are a couple of culprits, right here. First up: If you train, your coronary heart pumps extra blood to your exhausting working muscular tissues. This momentum then causes your capillaries to expand, and as they achieve this, they stimulate the encompassing nerve cells in your physique—and your mind interprets that sign as an itch. “It is a extra probably state of affairs for the physique versus the face,” says board-certified dermatologist Deanne Mraz Robinson, M.D., FAAD, co-founder of Modern Dermatology and assistant scientific professor of dermatology at Yale New Haven Hospital, (since your bigger muscle teams are powering the toughest, and thus require extra blood stream), “However the identical science applies.”
Or, if you happen to’re susceptible to flushing while working out, itch can definitely comply with. “Train results in dilation of your blood vessels to reinforce circulation to your pores and skin and muscular tissues,” says board-certified dermatologist Joshua Zeichner, M.D. That is usually factor—in any case, it’s elevated circulation that delivers vitamins to the cells and lends the beloved “post-workout glow.” However for some individuals (particularly these with truthful to medium pores and skin tones, delicate pores and skin, or circumstances like rosacea), it will possibly result in irritation, which can lead to flushing, bumps, and, sure, itching.
In some circumstances, that prickly sensation can even signify a sort of warmth rash, known as miliaria rubra. “It is a situation the place there are blockages inside the sweat glands, resulting in tiny, pink bumps and a prickly or itchy feeling,” says Zeichner. “This develops when sweat is trapped within the glands due to points like non-breathable, moist exercise clothes sticking to the pores and skin.” It’s additionally rather more widespread in scorching, humid climate—say, if you happen to’re jogging outdoors noon within the throes of summer time.
And, lastly, individuals can simply react to their very own sweat. Whereas sweat can effectively clear pores, some people could also be hypersensitive to its contents. “Moisture, warmth, and sweat can all trigger irritation of the pores and skin,” says Mraz Robinson. Easy as that.