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For as long as I can remember, my legs will start to itch when I begin jogging. Sometimes the itching is unbearable and I have to stop. I noticed that it doesn't happen during sprinting / high intensity interval work. Is there a reason for this?

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What kind of clothing are you wearing? Because I always have this on my back and blame those darn hairs rubbing against the functional clothing! –  Ivo Flipse Mar 1 '11 at 21:38
    
@Ivo: it happens with everything: shorts, sweats, etc. –  blue Mar 1 '11 at 21:44
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up vote 10 down vote accepted

Itching/tingling indicates an increase in bloodflow due to expanded capillaries and arteries. This problem should go away as you increase your level of physical fitness. If the itching comes with a rash though, it's more likely to be exercise-induced anaphylaxis (an allergic reaction).

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