What could cause nipple pain on one side while breastfeeding?

Reviewed by Yoshinori Abe, MD

Internal Medicine

One-sided nipple pain while breastfeeding is often caused by a shallow or poor latch, but it can also stem from Raynaud's phenomenon (vasospasm of the nipple), a tongue or lip tie affecting baby's jaw movement, thrush, mastitis, or a clogged duct. Identifying the specific cause is essential, because each condition requires a different treatment approach—from latch adjustments to medical care.

Because the causes range from easily corrected positioning issues to conditions needing prompt treatment, guessing can prolong pain and impact your milk supply. A free, instant, online symptom check can help you pinpoint likely causes based on your specific symptoms and guide you toward the right next steps—whether that's a lactation consultant, your OB, or your baby's pediatrician.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn why unilateral nipple pain happens Discover if your nipple pain needs care Find out what causes breastfeeding nipple pain See OTC relief for nipple pain Find a doctor for nipple pain Understand home remedies for nipple pain Check if nipple pain needs urgent care

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Explanation

Nipple pain on one side during breastfeeding can be uncomfortable and concerning. There are several possible reasons for this pain.

Raynaud's Phenomenon: This condition involves the blood vessels in the nipple going into spasm, causing pain. It can happen during breastfeeding and is treatable.
Latch Problems: Sometimes, the baby may not latch onto the breast properly. This can happen if the baby has a jaw issue, like mandibular asymmetry, which means their jaw is not even. This can make breastfeeding painful on one side.
Other Causes: There are other potential causes of nipple pain during breastfeeding that are less common but still important to consider.

If you experience nipple pain on one side, you can use our free AI symptom checker to help identify possible causes, then talk with a healthcare provider or lactation consultant who can suggest ways to make breastfeeding more comfortable.

(References)

Anderson JE, Held N, & Wright K. (2004). Raynaud's phenomenon of the nipple: a treatable cause .... Pediatrics, 15060268.
Charette C, & Théroux L. (2019). Causes of Pain with Breastfeeding Insight into 11 Cases. Breastfeeding medicine : the official journal of the Academy of Breastfeeding Medicine, 31314578.
Wall V, & Glass R. (2006). Mandibular asymmetry and breastfeeding problems. Journal of human lactation : official journal of International Lactation Consultant Association, 16885493.

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