There are a couple of culprits, right here. First up: Once you train, your coronary heart pumps extra blood to your arduous working muscle mass. This momentum then causes your capillaries to expand, and as they accomplish that, they stimulate the encompassing nerve cells in your physique—and your mind interprets that sign as an itch. “It is a extra doubtless 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 medical professor of dermatology at Yale New Haven Hospital, (since your bigger muscle teams are powering the toughest, and thus require extra blood move), “However the identical science applies.”
Or, in case you’re susceptible to flushing while working out, itch can actually observe. “Train results in dilation of your blood vessels to boost circulation to your pores and skin and muscle mass,” says board-certified dermatologist Joshua Zeichner, M.D. That is usually a very good 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 honest to medium pores and skin tones, delicate pores and skin, or circumstances like rosacea), it may result in irritation, which can lead to flushing, bumps, and, sure, itching.
In some circumstances, that prickly sensation also can characterize a sort of warmth rash, known as miliaria rubra. “It is a situation the place there are blockages throughout the sweat glands, resulting in tiny, crimson 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, in case you’re jogging exterior noon within the throes of summer season.
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.