Your nipples are bound to hurt if forced with pressure and for that know that its totally natural due to sensitivity in the tissue no worries!"
Mastitis or pregnancy
You may very well be pregnant .
That there is an alien growing inside of your boob
Nipples may hurt due to; infection, allergy, friction and hormonal changes.
If your nipples hurt or you have tender breasts it just means that your boobs are growing and you are getting ready to start your period or have your next period, in other words it is perfectly normal.
It could mean that you're about to come on your period
Following childbirth a woman's nipples will get hard and the breasts will hurt when engorged with milk. See a doctor to make sure there are not any other medical conditions causing this.
if your breasts, or nipples hurt and your a virgin it just means that your breasts are in the progress of developing, it will hurt but theres nothing to worry about its just the pattern or life!
There is a good chance your nipples will hurt in the beginning, middle and/or final stages of pregnancy.
Your nipples could hurt at anytime, that doesnt mean you could be pregnant. The question is...Did you have sex ? Try pregnancy tests, or go to the doctor.