There's a reason nipples are considered one of the most erogenous zones of the human body. These highly sensitive body parts are both easily stimulated and easily irritated, and there are many reasons a person might find his or her nipples hurting from time to time. One of the most common and easily cured causes of nipple pain is wearing tight or ill-fitting undergarments and clothing. But nipple pain is also a problem for women who are pregnant or breastfeeding.
2. They're Infected
1. You have an infection in your nipples.
Sore nipples affect almost all of us at some point, and the tendency is to presume the cause is hormonal; down to periods or even due to pregnancy. While these can certainly be reasons for breast tenderness, there's plenty more going on inside your body that can make you feel uncomfortable. The most likely reason for your soreness is hormonal. He added that "higher oestrogen levels cause the breast ducts to enlarge during your period," so take a look at your monthly cycle before stressing. This one kind of makes sense.
It can happen out of nowhere. There you are, standing in the checkout line at a grocery store, when all of a sudden your nipples become erect. Random nipple hardness is totally normal from time to time. The nerves in the nipple react to stimuli, both physical and psychological. So an arousing thought, change in temperature, or something as simple as the fabric of your shirt brushing against your skin can cause one or both of your nipples to become erect. However, there are some underlying health issues that can also lead to nipple hardness. Sometimes, the products we use on our breasts can make our nipples hard. Soaps, shower gels, and lotions can trigger an allergic reaction. So can certain laundry detergents and fabrics.
Have you thought about your nipples lately? Aside from recent ventures into the news for the Free The Nipple campaign, people often don't pay much attention to these highly sensitive parts of their body. They're one of our erogenous zones, and are part of the same set of arousal signals to the brain as the cervix, vagina, and clitoris. If your sex partner is neglecting your nipples, you're likely missing out. Nipples get a lot of attention in pregnancy, largely because your nipples get more sensitive , but they deserve a bit of love the rest of the time too — because our nipples can actually tell us about our health.