so im training for a half marathon, and when i get to around 5 miles my nipples start to hurt, at 6 miles they're stinging like a beast and at around 7 miles they actually bleed. well, only my left one. my right one kinda hurts but it's not bleeding. keep in mind my shirt gets soaked in sweat. is it just the fabric rubbing against my nipples? it's just a normal medium (which is a little big on me) hanes cotton t-shirt. any advice is appreciated, thank you.
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