Sore nipples can be caused by something as temporary as a hormone shift, but it could also be a sign of conditions like cancer or an infection.
Nipple Pain Remedies - American Pregnancy Association
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12 Reasons You're Experiencing Breast Pain - HealthyWomen
Buy Now Guaranteed Satisfied File:Nipple on shiny breast.png - Wikimedia Commons, breast nipple
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Why Do My Nipples Hurt? Causes, Treatment, When to see a Doctor
Why Does My Nipple Hurt?
Itchy Nipples: 6 Common Causes Why Your Nipples Are Itchy - GoodRx
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Sore Nipples from Pumping - Exclusive Pumping
Sore Nipples: 15 Reasons for Sensitive, Tender or Painful Nipples