Answer by  
                                                                                          SashaDarkCloud (5764)
                                                            
                          
                          
                                                           If they are overly sensitive and they are given a lot of attention, after awhile they can get sore. If it is too cold your nipples can get sore from being too hard. Extreme excitement in a sexual way can cause your nipples to get hard and also sore. Though if it persists, you can see a doctor about it.