November 25, 2022

Runner’s Itch: Why You Might Itch When You Run

Your body’s natural response to starting workouts may include an urge to scratch

Two runners outside.

You’re midway through a run when an itchy feeling hits your legs. It’s barely noticeable at first. Then it gets a bit worse … and then a little uncomfortable … and then climbs to PLEASE MAKE IT STOP levels.


Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

Within minutes, scratched-up thighs can replace a runner’s high as you claw at your legs in search of relief.

This sensation is known as runner’s itch ­— and it’s actually pretty common for beginning runners or those restarting their training after taking time off. So, what causes this temporary misery? Exercise physiologist Katie Lawton, MEd, has your answer.

What is runner’s itch?

The name of this condition is a near-perfect match for what it is. Basically, runner’s itch refers to a prickly feeling that develops on your skin during exercise. “It’s exactly what it sounds like,” says Lawton.

The itchiness typically hits your legs or stomach — and it can be intense enough to stop you in your tracks to start scratching.

The good news? The condition isn’t a cause for major concern. Better yet, runner’s itch is temporary and typically subsides soon after the workout. “It’s not something that usually hangs around,” notes Lawton.

It’s also not something guaranteed to hit every new runner or workout warrior.

One last thing, too: This aggravating itchiness doesn’t only pain runners. It can flare up during any cardio activity that elevates your heart rate and gets your blood pumping. (More on that in a moment.)

Symptoms of runner’s itch

Itchy skin (and the urge to scratch it) tops the list of symptoms. Your skin also may become:

  • Red or splotchy in appearance.
  • Warm to the touch.

What causes runner’s itch?

It’s time to talk about blood flow, the force that flips the itch switch. Here’s how it happens.


As you start running or doing a cardio workout, your heart kicks into a higher gear to deliver blood and oxygen to your muscles. This rush of blood fills the hair-thin blood vessels called capillaries that connect arteries and veins.

As those capillaries expand, they can bump against nearby nerve endings. That stimulation of nerve cells is enough to launch an itchy-itchy feeling.

If you’re new to running or returning to it, that capillary expansion can really set things off.

“It can be part of your body’s vascular response to a change in activity,” explains Lawton. “If you’re going from a more sedentary lifestyle to suddenly running a bunch of miles, there’s a chance you experience runner’s itch.”

There’s also research that suggests your body may release histamine during exercise to fight fatigue, which could also cause blood vessels to expand. (Histamine, of course, is typically used if your body senses a threat from an allergen. Insert your allergic-to-running joke here.)

Can runner’s itch be stopped?

Let’s look at this in two ways — immediate and long term.

Immediate relief from runner’s itch

That itchy feeling should stop with your workout as your heart rate slows, blood flow lessens and those expanded capillaries shrink a bit, says Lawton.

If the itchiness lingers, though, try:

  • Taking an antihistamine.
  • Applying an anti-itch skin cream.
  • Slipping into a warm bath, perhaps with Epsom salt.

Long-term relief from runner’s itch

If you condition your body to handle that cardio-induced blood flow, you’re less apt to experience runner’s itch. Slowly working your way into a running program may help keep the itching at bay.


“Consider the itching a signal from your body that you may be overdoing it, then adjust accordingly,” suggests Lawton.

And once you establish a running routine, keep with it. Logging consistent miles helps your body become better equipped to handle increased blood flow demands without triggering an itchy response.

In addition, wearing compression socks also can help improve circulation in your legs and minimize potential problems.

Other potential itch sources

An itch while running doesn’t have to be runner’s itch, of course. Trotting for many miles at a time while pouring out sweat brings all sorts of skin complications. “Chafing and irritated skin are very real things for runners,” says Lawton.

So, before you automatically assume you have a case of runner’s itch, consider these four factors, too:

  1. Are your clothes rubbing you wrong? An ill-fitting shirt or shorts can cause all sorts of skin misery for runners. Give a different outfit a test run if you experience itchiness. (Also, try to use gear made of moisture-wicking fabrics.)
  2. Do you have sensitive skin? To rule out external irritants, consider trying a new laundry detergent or soap if you experience itching during a workout. Make sure to moisturize your skin, too.
  3. Did you hydrate? Dehydration can lead to dry, itchy skin. Make sure you’re drinking enough fluids during the day.
  4. Are you taking new medications? Your itchy skin could be an allergic response.

What if the itch continues?

A basic case of runner’s itch typically resolves itself. But if the symptoms continue or worsen over time, it’s worth talking about with a healthcare provider.

And reach out to a doctor if your itchiness is joined by dizziness or breathing issues.

“If the itching or rash doesn’t seem temporary, see someone about it,” states Lawton. “And if you’re noticing symptoms that seem to go beyond runner’s itch, it’s worth going in to get checked.”

Related Articles

person scratching at their itchy skin on their chest
January 2, 2024
Is Itchy Skin a Sign of Cancer?

Anything from minor irritations and chronic diseases to, yes, cancer can cause persistent itching

two people each scratching their eczema on their arms
December 28, 2023
Why Eczema Itch Is So Intense — and How To Stop It

From hyperactive immune response to disordered nerve connections, the itch is real

Back of person's head with long hair with hands scratching their scalp
December 10, 2023
Itchy Scalp? 8 Common Causes and How To Find Relief

Options range from allergic reactions and head lice to chronic conditions and fungal infections

Mosquito bite
May 29, 2023
Bug Off! 9 Ways To Prevent Mosquito Bites

Keep pesky bugs at bay by covering your skin, avoiding perfumes and using insect repellant

Dermatologist checking patient's arm.
January 4, 2023
Can Skin Cancer Make You Itch?

In some cases, itchiness can be a symptom of skin cancer

Close-up shot of sunburnt skin, peeling on the shoulder to expose raw skin.
March 17, 2022
What the Heck Is Hell’s Itch?

A dermatologist explains this agonizing type of sunburn

woman applying moisturizer to skin
November 11, 2021
Home Remedies for Itchy Skin

Tips and tricks to soothe the itch

woman itching bra strap area
January 17, 2021
Why Do My Breasts Itch Inside?

The short answer from a breast health expert

Trending Topics

glass of cherry juice with cherries on table
Sleepy Girl Mocktail: What’s in It and Does It Really Make You Sleep Better?

This social media sleep hack with tart cherry juice and magnesium could be worth a try

Exercise and diet over three months is hard to accomplish.
Everything You Need To Know About the 75 Hard Challenge

Following five critical rules daily for 75 days may not be sustainable

Person in foreground standing in front of many presents with person in background holding gift bags.
What Is Love Bombing?

This form of psychological and emotional abuse is often disguised as excessive flattery