Bloody Stool During Pregnancy: Causes and When to Worry

Seeing blood in your stool during pregnancy can be scary, but it is not always a sign of something serious. In many cases, bloody stool during pregnancy is caused by common issues like hemorrhoids or anal fissures, which are more likely to happen as your body changes. Still, it is important to know when bleeding is harmless and when it may need medical attention.

This article explains the most common causes of bloody stool in pregnancy, what the blood may look like, when to call a doctor, and what you can do to help prevent it.

Is bloody stool normal during pregnancy?

Bloody stool is not considered normal, but it is fairly common during pregnancy. The most frequent causes are related to constipation, straining, and pressure from the growing uterus. Many pregnant people notice a small amount of bright red blood on toilet paper or in the toilet after a bowel movement.

While small amounts of blood are often caused by minor problems, any rectal bleeding during pregnancy should be mentioned to your healthcare provider, especially if it happens more than once or comes with pain, weakness, or changes in bowel habits.

Common causes of bloody stool during pregnancy

1. Hemorrhoids

Hemorrhoids are swollen veins in or around the rectum. They are one of the most common causes of bloody stool during pregnancy.

Pregnancy increases the risk of hemorrhoids because:
– Hormonal changes slow digestion
– Constipation becomes more common
– Straining during bowel movements puts pressure on rectal veins
– The uterus adds pressure to the pelvis and rectum

Hemorrhoids often cause:
– Bright red blood on toilet paper
– Blood on the surface of the stool
– Itching or irritation around the anus
– A small lump near the anus
– Discomfort while sitting or having a bowel movement

For more detail on this common issue, see bleeding hemorrhoid causes, relief, and when to worry.

2. Anal fissures

An anal fissure is a small tear in the lining of the anus. It often happens when hard stool stretches the area too much, usually because of constipation.

Signs of an anal fissure include:
– Bright red blood after a bowel movement
– Sharp pain during or after passing stool
– A burning sensation
– Fear of having another bowel movement because of pain

Anal fissures are usually minor, but they can be very uncomfortable.

3. Constipation and hard stools

Constipation does not directly cause bleeding, but it often leads to hemorrhoids or fissures. Pregnancy hormones slow down the digestive system, and iron supplements can make constipation worse.

If you are straining often or passing hard, dry stools, this may be the underlying reason for the bleeding.

4. Rectal irritation

Sometimes, frequent wiping, diarrhea, or irritation from wiping too hard can cause small amounts of blood. This is usually light and short-lived, but persistent irritation can lead to bleeding.

5. Less common causes

Although most cases are due to hemorrhoids or fissures, bloody stool can sometimes be caused by other conditions, such as:
– Inflammatory bowel disease
– Infection in the intestines
– Polyps
– Ulcers
– More serious gastrointestinal bleeding

These are less common, but they are important to rule out if symptoms are severe or ongoing.

What does the blood look like, and what does it mean?

The appearance of the blood can give clues about where it is coming from.

Bright red blood

Bright red blood usually means the bleeding is coming from the lower digestive tract, such as the rectum or anus. This is most often caused by hemorrhoids or an anal fissure.

Dark red or maroon blood

Darker blood can suggest bleeding higher up in the digestive tract, though it can also happen if blood has been in the intestines for a while. This should be checked by a doctor.

Black, tarry stool

Black, sticky, tar-like stool may mean bleeding from higher in the digestive tract, such as the stomach. This is more concerning and needs urgent medical evaluation.

To learn more about stool color changes and what they can mean, you can also read MedlinePlus guidance on black or tarry stools.

When should you worry about bloody stool during pregnancy?

You should contact your doctor or midwife if you notice any rectal bleeding during pregnancy, especially if it is new, repeated, or not clearly linked to constipation or hemorrhoids.

Seek medical advice soon if you have:
– Repeated bleeding
– A larger amount of blood
– Blood mixed into the stool
– Painful bowel movements that keep happening
– Ongoing constipation or diarrhea
– Rectal pain or swelling
– Unexplained weight loss
– Fever
– Belly pain

If your symptoms seem mild but keep coming back, it is still worth asking your clinician about bloody stool during pregnancy so you can address the cause early.

When is bloody stool an emergency?

Get urgent medical help right away if you have:
– Heavy bleeding
– Black, tarry stool
– Dizziness or fainting
– Severe abdominal pain
– Vomiting blood
– Signs of dehydration
– Sudden weakness or shortness of breath

These symptoms may point to a more serious problem than hemorrhoids or fissures.

How do doctors evaluate bloody stool during pregnancy?

Your doctor will usually ask:
– How much blood you saw
– What color it was
– Whether you have pain or constipation
– Whether the bleeding happened once or keeps returning
– Whether you have fever, diarrhea, or stomach pain

They may perform a physical exam and, if needed, check for hemorrhoids or fissures. In some cases, additional tests may be recommended to rule out other causes.

Depending on your symptoms, your provider may also ask about diet, iron supplements, and bowel habits, since those details often explain why bloody stool during pregnancy develops in the first place.

How to help prevent bloody stool during pregnancy

Preventing constipation is one of the best ways to reduce your risk of bleeding.

Eat more fiber

Fiber helps soften stool and make bowel movements easier. Good sources include:
– Fruits
– Vegetables
– Whole grains
– Beans
– Nuts and seeds

Drink enough water

Staying hydrated helps keep stools soft. Many pregnant people need more fluids than usual, especially if they are taking iron supplements.

Stay active

Light exercise, such as walking or prenatal yoga, can help keep digestion moving.

Do not strain

Try not to force bowel movements. If you feel pressure but cannot go easily, get up and try again later rather than pushing hard.

Use the bathroom when you need to

Holding in stool can make constipation worse and increase the risk of hard stools and bleeding.

Ask about iron supplements

If your iron supplement is causing constipation, your doctor may recommend a different type or a stool-softening strategy.

These daily habits can also reduce the chance that bloody stool during pregnancy will become a recurring issue.

Home care for hemorrhoids or fissures

If your doctor says the bleeding is likely due to hemorrhoids or a small fissure, these steps may help:

• Take warm sitz baths
• Use unscented wipes or rinse with water after bowel movements
• Avoid harsh wiping
• Use a stool softener only if recommended by your doctor
• Apply doctor-approved creams or ointments
• Sleep and rest when possible to reduce pressure and strain

Do not use over-the-counter treatments without checking with your healthcare provider, since not all products are safe in pregnancy.

If you are unsure whether your symptoms are from hemorrhoids, a fissure, or something else, discuss bloody stool during pregnancy with your prenatal care team before trying new remedies.

Can bloody stool harm the baby?

Small amounts of blood from hemorrhoids or fissures usually do not affect the baby. The concern is more about finding the cause and making sure there is no more serious digestive or rectal condition. Heavy bleeding, severe illness, or dehydration can become a problem, so it is important to get checked if symptoms seem unusual.

In most cases, bloody stool during pregnancy is a mother’s comfort and safety issue rather than a direct threat to the baby, but that does not mean it should be ignored.

Frequently asked questions

Is a little blood on toilet paper during pregnancy serious?

Not always. Small amounts of bright red blood are often caused by hemorrhoids or fissures. Still, you should let your doctor know.

Can constipation cause bloody stool in pregnancy?

Yes. Constipation often leads to straining, hemorrhoids, or anal fissures, which can cause bleeding.

Should I worry if I only saw blood once?

A one-time small amount of blood may not be dangerous, but it should still be mentioned to your healthcare provider, especially if it happens again.

Is black stool in pregnancy normal?

No. Black, tarry stool can be a sign of internal bleeding and should be checked right away.

Can pregnancy supplements cause bloody stool?

Iron supplements do not directly cause bleeding, but they can cause constipation, which may lead to hemorrhoids or fissures.

Does bloody stool during pregnancy always mean hemorrhoids?

No. Hemorrhoids are common, but bloody stool during pregnancy can also come from fissures, irritation, infection, or other digestive conditions, so repeated bleeding should be assessed.

The bottom line

Bloody Stool During Pregnancy is most often caused by hemorrhoids, anal fissures, or constipation-related straining. A small amount of bright red blood is commonly seen with these conditions and is usually not dangerous, but it should still be reported to your doctor.

You should worry more if the bleeding is heavy, repeated, dark, or accompanied by pain, fever, dizziness, or black stool. The safest approach is to mention any rectal bleeding to your healthcare provider so the cause can be identified and treated appropriately.

Managing constipation, eating enough fiber, drinking fluids, and avoiding straining can go a long way toward preventing bloody stool during pregnancy.