Ouch, nipple pain can be quite uncomfortable! It can be caused by a variety of factors such as hormonal changes, ill-fitting clothing, or even physical activity. Have you noticed if it occurs at specific times or if anything seems to trigger it? It's always a good idea to see a healthcare professional if the pain persists. What have you tried so far to ease the discomfort? I'm here to chat if you'd like to talk more about it.