His face turned bright red while running.

Blushing while running is a common problem, especially for women and those with fair skin.

When you run, your body generates heat. Sweating helps cool you down, and your body also increases blood flow to your skin to help regulate temperature. Your capillaries dilate so more blood can flow through them, dissipating more heat through the skin. The capillaries in your cheeks are wider than elsewhere and closer to the surface. So, when the capillaries in your cheeks dilate, more blood gets closer to the surface, giving your face a rosy red color.

Many runners still blush, no matter how much their fitness improves. In fact, some studies show that fitter athletes tend to blush more often and earlier in training compared to less fitter athletes.

Everyone's body processes heat differently, and just as some runners sweat more than others, some people blush while others don't. Some people naturally have more capillaries.

Others may have naturally occurring capillaries that supply more blood to the face during exertion. Either way, they are more prone to blushing during exercise.

Blushing of the face is a common symptom among many runners during and after running. (Image: Popsugar) — Blushing of the face is a common symptom among many runners during and after running. (Image: *Popsugar)*

Hot weather

You may find your skin turns redder if you run intensely or in hot, humid weather. When the weather is warm, try running early in the morning or later in the evening, or indoors if the temperature gets too high.

Make sure you stay hydrated while running and drink when you're thirsty. You can also splash water on your head, neck, and underarms to cool down.

If you experience symptoms other than facial flushing, such as dizziness or nausea, you may be suffering from a heat-related illness, such as dehydration, heatstroke, or heat exhaustion. Stop running immediately, drink water, and go into the shade.

Exertion

Most flushes caused by exertion will last no more than 15 to 20 minutes. When experiencing this, you can spray or dab cold water on your face to lower your body temperature and reduce your heart rate.

You can take a cold shower, wash your face with cold water, or use a cold towel to wipe your face after resting for a while following your workout. Some facial cleansers containing aloe vera can also be helpful, to soothe the skin, and caffeine to constrict blood vessels.

After cleansing, you can moisturize your face, trying an anti-redness or formula for sensitive skin. Apply a green color-correcting primer, followed by a tinted moisturizer.

Talk to a healthcare professional.

While flushing your face while running is usually harmless, you should still mention it to a healthcare professional, especially if you're a beginner. If you have other symptoms such as diarrhea, wheezing, hives, or difficulty breathing, it could be a sign of a more serious condition.

Runners should also note whether they experience facial flushing in other situations. Does the condition worsen when eating certain foods or if you drink alcohol? Consider all of this and consult a healthcare professional.

If facial flushing lasts for more than half an hour after exercise, or disappears and recurs later in the day, it could be a sign of rosacea. If so, this symptom is treatable.

Hong Duy (according to Very Well Fit )

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