Symptoms of Chafing:
Cause of Chafing:
Prevention of Chafing:
To prevent chafing, wear running attire made of synthetic materials such as CoolMax that wick moisture away. Don't wear cotton clothing because once it gets wet, it stays wet. In addition, cotton is a rough material and when it's constantly moving against your skin, it can rub your skin raw. (If you've ever seen a male runner with bloody nipples, he's most likely wearing a cotton shirt.)
For women, make sure you're wearing a synthetic sports bra with smooth seams.
If you're doing a long distance race such as a marathon, you should assume you could chafe, even if it's never happened to you before. Use Body Glide or other lubricant and make sure you race in clothes and gear that you've tried out during your long runs.
Since chafing can be caused by loose running clothing, it's better to wear running clothes that are snug. Some runners prefer to wear spandex bike shorts to prevent chafing between their legs.