Hematologist
CION Cancer Clinics
Bleeding on blood thinners: the signs that matter | CION Cancer Clinics
On a blood thinner, some extra bruising and small bleeds that stop with pressure are expected. Black or bloody stools, red or coffee-ground vomit, coughing up blood, any head injury, a sudden severe headache or bleeding that will not stop are emergencies: go to the nearest emergency department or call 108. This page sorts the signs by urgency and explains what you can do day to day. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- How much bleeding is normal on a blood thinner?
- Which bleeding can wait, and which cannot?
- What should you do while you get help?
- What do people often believe about bleeding on blood thinners?
- What do the words on your report mean?
- How can you lower your risk, and what can this page not tell you?
- Common questions about bleeding on blood thinners
!
Go to the nearest emergency department now, or call 108
If you take a blood thinner and have black or bloody stools, vomit that is red or looks like coffee grounds, coughing up blood, a sudden severe headache, a fall or knock to the head, bleeding that will not stop with firm pressure, or sudden weakness, confusion or trouble speaking, do not wait for your next appointment. Tell the emergency team the name of your blood thinner and when you last took it. Carry the tablet strip if you can.
The short answer
How much bleeding is normal on a blood thinner?
Some extra bruising and small bleeds, like a shaving cut that takes longer to stop, are common and expected. Bleeding that is heavy, will not stop, comes from inside the body or follows a head injury is not normal, and needs same-day care.
Why blood thinners cause bleeding
Warfarin, acenocoumarol and the newer tablets such as apixaban and rivaroxaban all slow your blood's ability to clot. That is what protects you from a new clot in the leg or lung. The same effect means a small injury bleeds for longer. The medicine does not create new wounds, but it can make a hidden one, such as a stomach ulcer, show itself.
Who is more likely to bleed
The risk is higher if you are older, have had a bleed before, have kidney or liver disease, a low platelet count, a stomach ulcer, high blood pressure that is not controlled, or drink heavily. Taking painkillers such as ibuprofen, diclofenac or aspirin alongside a blood thinner adds to it. People on chemotherapy for cancer often have several of these at once.
Bleeding risk is a reason to watch closely and to tell your team early. It is not a reason to stop the medicine yourself, because a new clot can be just as dangerous.Not sure whether this applies to you?
Ask an oncologistSorting the signs
Which bleeding can wait, and which cannot?
Use these as a rough guide. If you are unsure which group a bleed belongs to, treat it as the more serious one.
Mention at your next visit
Minor bleeds that stop on their own and do not keep coming back.
- Small bruises you can explain
- Slight gum bleeding when brushing
- A cut that stops with a few minutes of pressure
Call your team today
Bleeding that is new, frequent or heavier than usual, but you are otherwise well.
- Large bruises with no knock to explain them
- Nosebleeds that keep returning
- Periods much heavier than normal
- Pink or red urine
- Blood in the whites of the eyes
Emergency, go now
Signs of bleeding inside the body, or bleeding you cannot control.
- Black, tarry or bloody stools
- Red or coffee-ground vomit
- Any head injury, even if you feel fine
- Sudden severe headache, dizziness or fainting
- A nosebleed or cut that will not stop with firm pressure
If bleeding starts
What should you do while you get help?
Press firmly
For a cut, press a clean cloth hard on it without lifting to check. For a nosebleed, sit up, lean forward and pinch the soft part of the nose. Do not tilt the head back.
Decide the level
If pressure does not work, or any emergency sign is present, go to the nearest emergency department or call 108. Do not drive yourself if you feel faint.
Take the details
Carry the tablet strip or prescription, your last INR report if you are on warfarin, and the time of your last dose. This helps the doctor decide whether to reverse the medicine.
Ask before the next dose
After any bleed beyond a minor one, call your team before your next dose is due and ask what to do. The decision to hold or continue belongs to them.
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Commonly believed
What do people often believe about bleeding on blood thinners?
"If I am bleeding, I should just skip the tablets for a few days."
Stopping on your own can let a clot grow or form again, which may be more dangerous than the bleed. Call your team. They weigh both risks and tell you exactly what to do.
"A bump on the head is nothing if there is no cut."
On a blood thinner, bleeding inside the skull can start slowly and show no signs at first. Any real knock to the head needs to be checked in an emergency department the same day.
"Dark stools are just from iron tablets."
Iron can darken stools, but black, sticky, tarry stools can mean bleeding in the stomach or gut. If you are unsure, get checked rather than assume.
"Herbal remedies are safe because they are natural."
Some herbal products and supplements, including large amounts of turmeric, garlic, ginger or fish oil capsules, can add to bleeding risk or change how warfarin works. Tell your doctor about all of them.
On your report
What do the words on your report mean?
- INR
- A blood test for people on warfarin that shows how long blood takes to clot. A result above your target range raises bleeding risk. Ranges differ between labs, so it is read alongside earlier results.
- Platelets
- Small blood cells that help plug a bleeding point. A low count adds to bleeding risk on a blood thinner.
- Haemoglobin
- The protein in red cells that carries oxygen. A falling result can be a sign of slow hidden bleeding.
- Reversal
- Giving a medicine or blood product that quickly undoes a blood thinner during a serious bleed.
- Occult blood
- Blood in the stool too small to see, found only on a lab test.
Day to day
How can you lower your risk, and what can this page not tell you?
Most bleeds on blood thinners are small, and a few habits reduce the chance of a serious one. None of them replace your regular reviews.
Habits that help
Take the tablet exactly as prescribed, at the same times each day. Keep your INR appointments if you are on warfarin. Use a soft toothbrush and an electric razor. Wear footwear at home to avoid cuts. Show every new medicine, painkiller, cough syrup or ayurvedic product to your pharmacist or doctor before taking it. Tell every doctor, dentist and lab that you are on a blood thinner.
What this page cannot tell you
It cannot judge your own bleeding risk, whether your medicine should change, or how long you need to take it. Those depend on why you need a blood thinner, your kidneys, your other conditions and your blood results, read together.
At CION, a haematologist reviews repeated or unexplained bleeding alongside your reason for treatment. Bring your reports and every medicine you take.Questions we are asked
Common questions about bleeding on blood thinners
Is bruising easily a sign my dose is too high?
Not always. Some extra bruising is expected on any blood thinner. Large bruises without a knock, bruises that keep appearing, or bruising with other bleeding are worth a call to your team the same day. On warfarin, they may check your INR sooner than planned.
My gums bleed when I brush. Should I worry?
Slight bleeding when brushing is common. Switch to a soft brush and keep seeing your dentist, because gum disease makes it worse. If the bleeding is heavy, lasts a long time or starts without brushing, call your team. Tell your dentist you take a blood thinner.
My periods have become much heavier. What should I do?
This is common on blood thinners and should not be put up with in silence. Tell your doctor. Heavy periods can lower your haemoglobin and cause tiredness. There are treatments that help, and your gynaecologist and haematologist can plan them together without leaving you unprotected from clots.
Which painkiller is safe for a headache or body ache?
Paracetamol is generally preferred for ordinary aches, but ask your doctor or pharmacist first. Ibuprofen, diclofenac, naproxen and aspirin raise bleeding risk. A sudden, severe or unusual headache is different: that needs emergency care, not a painkiller.
I fell but I feel fine. Do I still need to go to hospital?
If you hit your head, yes. Bleeding inside the skull can develop slowly on a blood thinner, and feeling fine at first does not rule it out. For a fall without a head injury, watch for swelling, large bruising or pain that worsens, and call your team.
Can the effect of a blood thinner be reversed in an emergency?
Yes, in most cases. Warfarin can be reversed with vitamin K and blood products. Some newer tablets have their own reversal medicines, though not every hospital stocks them. Other measures are used if not. This is why telling the team which medicine you take, and when, matters so much.
Does chemotherapy change my bleeding risk?
It can. Some chemotherapy lowers your platelet count, and some cancers bleed more easily. Your oncologist and haematologist may adjust your blood thinner around your counts. Tell the chemotherapy team that you take one, and report any new bleeding promptly.
Can I drink alcohol on a blood thinner?
Ask your doctor about your own situation. Heavy drinking or binge drinking raises bleeding risk, can irritate the stomach lining and, on warfarin, can make INR results swing. Small amounts may be allowed for some people. Be honest with your team about how much you actually drink.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Anticoagulant medicines
- NHS — Warfarin
- American Society of Hematology — Blood Clots
- NHLBI — Venous Thromboembolism
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
DOACs vs WarfarinHow the bleeding risk differs between the twoWarfarin and INR MonitoringWhy a high INR raises bleeding riskMissed Anticoagulant Dose: What to DoWhat to do when a dose is missed or heldSurgery and Dental Work on AnticoagulantsPlanning procedures safely on a blood thinnerClotting, Thrombosis and AnticoagulationEvery guide on clots and blood thinners
Talk to us
Worried about bleeding on your blood thinner?
For an emergency, call 108 or go to the nearest emergency department. For repeated or unexplained bleeding, a CION haematologist can review your reports and medicines. One helpline serves every CION centre.