Can Random Bleeding Be a Sign of Cancer?
Health ConditionsCancer

Is This Weird Bleeding a Sign of Cancer?

Is This Weird Bleeding a Sign of Cancer?
Everyday Health
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Published on February 25, 2026
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Seeing blood when you don’t expect it can feel frightening. Bleeding can happen because of something minor, like a small cut or a nosebleed. But sometimes, it can point to a more serious problem, like cancer.

Your body manages bleeding through a delicate balance, which allows you to clot blood only when you need it, says Fadi Abu-Shahin, MD, a hematologist-oncologist at Houston Methodist Willowbrook Hospital in Texas. “Certain [cancers] can shift this equilibrium toward excessive clot formation,” Dr. Abu-Shahin says, and others can thin the blood.

“Tumors that grow in areas lined with delicate tissue, like the stomach, intestines, lung, uterus, vagina, or parts of the head and neck, can irritate or damage those surfaces,” says Sumana Veeravelli, MD, a medical oncologist and hematologist at City of Hope Cancer Center Gilbert in Gilbert, Arizona. “When that happens, bleeding may be one of the first signs that something isn’t quite right.”

Learn the most common types of “weird” bleeding, the connection between abnormal bleeding and cancer, and when it’s time to call your healthcare provider.

When There’s Blood in Your Urine

Blood can show up in your urine for several reasons.

 “Often, blood in the urine can be due to noncancerous conditions, like a bladder or kidney infection or kidney stones,” says Bethany Samuelson Bannow, MD, the director of classical hematology at Cleveland Clinic Cancer Institute in Ohio. “Certain sexually transmitted infections, like chlamydia or gonorrhea, can also present as blood in the urine.”
But blood in urine can also point to cancer. For example, kidney and bladder cancers can irritate nearby tissues and cause bleeding.

If you have vaginal bleeding from endometrial, cervical, or ovarian cancers, this may also look like blood in your urine.

 To figure out whether the bleeding is coming from your vagina, you can insert a tampon and check for blood. If it comes out clean, that can help you rule out vaginal bleeding.
“Blood in the urine is never normal, and there are few signs or symptoms that can distinguish between cancerous or noncancerous causes,” says Dr. Samuelson Bannow. But most noncancerous causes of blood in the urine cause pain, so if your bleeding is painless, that may suggest cancer, Samuelson Bannow adds.

When There’s Blood in Your Poop

Bright red blood in your poop happens when irritation and inflammation in your colon or anus causes bleeding. Rectal bleeding can come from:

  • Hemorrhoids
  • Anal fissures
  • Diverticulitis, a disease where small pouches become inflamed and bulge out of the colon
  • Benign polyps
  • Inflammatory bowel disease

“Hemorrhoids are a common cause and typically cause blood on the outside of the stool and toilet paper, while other conditions often cause blood to be ‘mixed in’ with the stool,” says Samuelson Bannow.

But blood in your stool can also come from a tumor.

 “Cancer growing in the intestinal wall produces blood vessels that allow it to grow,” says Timothy Wagner, MD, a radiation oncologist at Houston Methodist The Woodlands Hospital in The Woodlands, Texas.
These delicate blood vessels can get easily irritated when stool passes by them, so rectal bleeding can be an early sign of a growing cancer, says Dr. Wagner. Stool shape can be another red flag: Thin or ribbon-like stools could suggest a tumor blocking the large intestine.

Even though plenty of benign conditions or injuries can cause blood on or in your poop, you shouldn’t ignore it, especially if it’s new, persistent, or you have other symptoms like fatigue, pain, or changes in bowel habits, says Toufic Kachaamy, MD, an interventional gastroenterologist and chief of medicine at City of Hope Cancer Center Phoenix in Arizona.

When You’re Bleeding Between Periods or After Menopause

Bleeding or spotting between periods can happen because of hormone fluctuations, birth control changes, fibroids, polyps, infection, injury, and stress.

 But bleeding after menopause is always abnormal.
Noncancerous causes of vaginal bleeding after menopause include:

  • Vaginal atrophy, which is thinning of the vaginal wall along with vaginal dryness
  • Hormone replacement therapy (HRT) changes
  • Uterine lining thickening
  • Cervical inflammation
  • Uterine polyps
But bleeding after menopause can also point to cancer of the cervix, uterus, or fallopian tubes.

 The blood can ooze from a tumor, or bleeding can happen when the lining of the uterus thickens in response to increased estrogen levels before a specific tumor has formed, says Samuelson Bannow.

If you notice any bleeding after menopause, even if it’s only spotting, let your provider know right away.

When You’re Bleeding From the Mouth or Nose

If you haven’t just walked away from a fistfight, bleeding from your nose or mouth may catch you off-guard. Nose-picking, dry air, and getting oxygen through a nasal cannula (small tubes delivering oxygen into your nostrils) can all contribute to nosebleeds, says Samuelson Bannow. Some people are also more prone to bleeding from the nose; there are many blood vessels near the surface inside.

“Bleeding in the mouth is most often due to issues with the gums and teeth, like gingivitis,” says Samuelson Bannow. But gum bleeding can also happen with hormone changes, low vitamin levels, problems with blood clotting, and stress.

Besides these causes, bleeding from the mouth or nose could be a symptom of leukemia or oral, throat, lung, or nasal cavity cancer.

“If you see a mass or a lesion in your mouth or nose that is bleeding, that should be checked out to rule out cancer,” says Samuelson Bannow, who also recommends reporting blood blisters in your mouth that have no obvious cause.

For blood that appears when you cough, tell your provider right away, too.

When a Cut Won’t Stop Bleeding

Platelets are small blood cells that help your blood clot when you have an injury.

 Many medical conditions can lead to bleeding by lowering platelet count, weakening platelet function, or disrupting the balance between proteins that promote or stop clotting, says Abu-Shahin. These conditions include:

  • Liver disease

  • Severe infections
  • Autoimmune disorders
  • Heavy alcohol use
  • Inherited genetic conditions, like hemophilia

  • Nutritional deficiencies, like iron, folate, and vitamin B12
  • Enlarged spleen
  • Pregnancy
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) use

Cancers like leukemia and lymphoma can also lower platelets by damaging bone marrow, which prevents them from forming.

 “When platelet levels drop, even small bumps or minor injuries can lead to noticeable bruising or bleeding,” says Dr. Veeravelli. Low platelets can cause serious bleeding, so, no matter the cause, tell your provider right away if your blood isn’t clotting like usual.

When Moles or Spots Bleed

Moles and spots on your skin can bleed for many reasons, like catching on a zipper or rubbing against clothing, says Samuelson Bannow. Conditions like diabetes make it harder for these wounds to heal. But bleeding — sometimes with pain, itching, and irritation — may be symptoms of skin cancer.

“Bleeding from skin cancers typically has to do with unhealthy cell growth and development, resulting in a wound or ulcer that cannot heal,” says Samuelson Bannow. If you have a wound that doesn’t get better, or heals partially then gets worse again, tell your provider.

When You Bleed From Your Ear

When you scrape your ear canal with a fingernail, or stick a cotton swab too far in, you can injure tissues and make them bleed. Other causes of ear bleeding include:

  • A ruptured eardrum
  • Getting hit in the ear or head
  • Severe ear infections
Ear cancer, a very rare type, can also cause bleeding from your ear, alongside numbness and trouble hearing.

 If you notice bleeding from one or both ears, see your provider. They can look in your ear canal and help you figure out what’s going on.

The Takeaway

  • Unexpected bleeding can feel frightening. Finding the cause can ease anxiety and set you on the path to diagnosis and treatment, if needed.
  • Cancers that cause bleeding include colon, uterine, cervical, kidney, bladder, skin, and blood cancers.
  • If you notice unusual bleeding from any part of your body, call your healthcare provider, who can help you discover why it’s happening.

Resources We Trust

EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
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Daniel Landau, MD

Medical Reviewer

Daniel Landau, MD, is a distinguished board-certified hematologist-oncologist with a career that has spanned two eminent institutions: the Orlando Health Cancer Institute and the Medical University of South Carolina. With a specialized interest in genitourinary oncology and hematology, he has been at the forefront of managing both benign and malignant conditions.

Dr. Landau is a pioneering figure in integrating advanced technology into oncology, having served as a director of telemedicine services. Under his leadership, multiple innovative systems have been designed and piloted, all with a singular focus: enhancing the patient experience.

Beyond his clinical and technological endeavors, Landau is deeply committed to medical education. He has dedicated significant time and expertise to nurturing the skills of medical students, residents, and fellows, ensuring that the flame of knowledge and compassion burns bright in the next generation of oncologists.

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Abby McCoy is an experienced registered nurse who has worked with adults and pediatric patients encompassing trauma, orthopedics, home care, transplant, and case management. She is a married mother of four and loves the circus — that is her home! She has family all over the world, and loves to travel as much as possible.

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