Finding blood in your breast milk can be frightening. You look down at the pump bottle and see pink liquid, or your baby spits up milk with a reddish tinge, and your stomach drops.
Here is the reassuring part. Blood in breast milk is common, and it rarely points to anything serious. Most of the time it is safe to keep feeding your baby while the cause sorts itself out.
Below you will find why pink or bloody milk happens, how to treat the usual causes, and the exact signs that mean it is time to call your doctor.
Key Takeaways
- Common Causes: Blood in breast milk usually comes from cracked nipples, rusty pipe syndrome, a clogged duct or mastitis, or broken capillaries in the breast.
- Usually Safe: You can keep breastfeeding or pumping even when the milk looks pink, orange, or strawberry-colored; a small amount of blood will not harm a healthy baby.
- Taste and Spit-up: Blood can make milk taste metallic or salty and may cause extra spit-up or dark stools; some babies fuss, but it is not dangerous.
- When to Call a Doctor: Get checked if the bleeding lasts more than about a week, comes from one breast with no cracks, or arrives with a lump, fever, or a firm, painful area.
Signs of Blood in Breast Milk
You usually spot this problem by sight. You might notice a change in color in your pumped milk, from light pink or orange through to brown or bright red.
Sometimes the milk looks normal, but you see specks of blood in your baby’s stool or dark, tarry poop.
Before you panic, run a quick diet check. Some foods and dyes tint breast milk and urine. Have you eaten beets or red berries, or had a drink with red food coloring in the last day? If so, the color usually passes within 24 hours.
If red foods are not the cause, the color is likely blood. Unsettling as that looks, it is often temporary and clears on its own.
Causes of Blood in Breast Milk
“Bloody milk” sounds alarming, but the causes are usually harmless and treatable. Here are the main reasons you might see red while pumping or breastfeeding.
1. Cracked or Damaged Nipples
This is the most common cause. If you have cracked or blistered nipples, blood from the broken skin can mix into your milk during let-down.
The damage often traces back to a shallow latch, a tongue tie, or the wrong flange size on your breast pump. Dry skin and eczema can also split the delicate skin (1).
Once the skin heals, the bleeding stops. This video has useful tips for treating sore nipples.
2. Rusty Pipe Syndrome
This one mostly shows up in first-time moms during the first week after birth. It turns colostrum or early milk brown, orange, or rusty, which is where the name comes from.
The cause is vascular engorgement. As your body ramps up for milk production, blood flow to the breasts increases fast and the milk ducts stretch. Sometimes the tiny blood vessels leak a little blood into the ducts. It is rare, affecting roughly 0.1% of breastfeeding moms, and it is usually painless and shows up in both breasts at once (2).
The good news is that the milk is nutritionally normal, and rusty pipe syndrome clears on its own within about three to seven days, so you can keep nursing straight through it. If the rusty color lasts longer than a week, check in with your doctor to rule out other causes.
3. Broken Capillaries (Intraductal Trauma)
Your breasts are full of tiny blood vessels called capillaries. They are fragile and can break if handled roughly.
A direct knock to the breast or incorrect use of a breast pump (suction set too high, for example) can rupture these vessels, and the blood then leaks into your milk (3).
4. Mastitis
Mastitis is a painful inflammation of the breast tissue, often with an infection behind it. It usually sets in when milk gets trapped in the breast (a clogged duct) or after missed feedings.
Along with fever and red streaks on the skin, mastitis can push blood into your milk. Keep breastfeeding or pumping often to move the milk along, which actually helps it clear (4).
5. Benign Intraductal Papilloma
An intraductal papilloma is a small, non-cancerous, wart-like growth inside a milk duct. It is the most common cause of bloody discharge from a single nipple, and it can happen during breastfeeding as well as outside it.
If you get spontaneous bleeding from one nipple with no pain and no visible cracks, this could be the reason (5). A doctor can confirm it with an ultrasound. Papillomas are benign, but doctors often recommend removing them, since a small share can hide atypical cells.
6. Breast Cancer
It is natural to fear the worst, so keep this in perspective: breast cancer is a rare cause of bloody discharge during breastfeeding.
That said, a form called Paget’s disease of the breast, or intraductal carcinoma, can show up as bloody discharge (6). If the bleeding does not stop after a week, or you feel a hard lump, see your healthcare provider promptly.
FAQs
It is hard not to worry when something looks off with your body. Here are answers to the questions moms ask most about blood in breast milk.
