Medical Oncologist
Blood counts
Bleeding that needs emergency care
Blood in vomit, urine or stool. Black tarry stools. Any bleeding that will not stop after ten minutes of firm pressure. A severe or unusual headache. Coughing blood. Heavy menstrual bleeding. Any of these means going to the nearest emergency department the same day, saying immediately that the person is on chemotherapy.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Which bleeding during chemotherapy is an emergency?
Blood in vomit, urine or stool. Black tarry stools. Any bleeding that will not stop after ten minutes of firm pressure. A severe or unusual headache. Coughing blood. Heavy menstrual bleeding. Any of these means going to the nearest emergency department the same day.
The reason is platelets. They are the cells that stop bleeding, and they fall in the middle of most chemotherapy cycles. Bleeding that would be trivial in an ordinary month can be serious during the low stretch, and it can continue when it would normally have settled.
Say that the person is on chemotherapy, immediately
On arrival, before anything else. It changes how urgently you are seen and what is checked first. Take the treatment summary and the medicine list, and say if the patient is on a blood thinner.
Do not treat bleeding at home
No painkillers to settle a headache, no home remedies, no waiting until morning to see whether it stops. Firm pressure on an external bleed while somebody arranges the journey is the whole of the home treatment.
Keep the hospital's day and night numbers on the fridge, photographed on two phones.
!
Go to the nearest emergency department now
Vomiting blood, or vomit that looks like coffee grounds · black tarry stools, or fresh blood in the stool · blood in the urine · coughing up blood · any bleeding that will not stop after ten minutes of firm pressure · a nosebleed lasting more than twenty minutes despite pinching · a severe, sudden or unusual headache · any head injury, however minor it seemed · sudden weakness, confusion, drowsiness or difficulty speaking · bleeding into the eye, or sudden change in vision · heavy menstrual bleeding soaking through protection · a swollen, tense, very painful joint or limb. Say the person is on chemotherapy as you arrive, and say whether they take a blood thinner. Do not give any painkiller first.
Not sure whether this applies to you?
Ask an oncologistWhat each sign means
Why these particular signs matter
- Black tarry stools
- Usually bleeding higher up in the stomach or gut, changed by passing through the bowel. It is frequently dismissed as something eaten, and it is one of the most important signs on this page.
- Vomit like coffee grounds
- Blood that has been in the stomach for a while. It does not look like fresh blood, which is why people do not recognise it. Treat it exactly as urgently as red blood.
- A severe or unusual headache
- With a low platelet count this can mean bleeding inside the head. It is the reason no painkiller should be taken first, and the reason any head injury needs assessment even when the person feels completely well.
- Tiny red or purple spots
- Pinpoint spots, often on the legs or inside the mouth, that do not fade when pressed. They indicate a very low platelet count and should be reported the same day even without other bleeding.
- Bleeding gums or frequent nosebleeds
- Common with falling platelets and usually manageable, but report them, because they are often the first sign that the count has dropped further than expected.
- Heavy menstrual bleeding
- Frequently not mentioned, because it feels like a separate subject. It is not. Soaking through protection, or passing large clots, needs the same day's attention.
On the way
What to do while you are getting there
Four things, and none of them involves waiting to see whether it settles.
Press firmly, and keep pressing
For an external bleed or a nosebleed, firm continuous pressure for a full ten minutes without lifting to check. Lifting to look is the commonest reason bleeding restarts. Sit upright and lean forward for a nosebleed.
Do not
- Tilt the head back
- Pack anything into the nose
Take the paperwork
Treatment summary, medicine list, the current medicine boxes, and the date of the last cycle. The casualty doctor needs to know where in the cycle the patient is, because that predicts the count.
Give nothing by mouth for a suspected internal bleed
If there is blood in vomit or black stools, no food, no water, no tablets until a doctor has assessed. Something may need to be done that requires an empty stomach.
Especially avoid
- Any painkiller from home
- Home remedies of any kind
Phone ahead if you can
Call the oncology number on the way so they know you are coming and can advise which hospital. But travel first and call from the vehicle rather than waiting at home to get through.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Being straight with you
What this page cannot tell you
It cannot tell you your platelet count or how low is too low. That is measured, and the thresholds differ by situation, by whether you are bleeding and by whether you take a blood thinner. Ask your own team what they are watching for.
It also cannot tell you whether a particular episode is serious. A nosebleed that settles in five minutes and one that does not are different situations, and the safe rule when platelets may be low is to treat uncertainty as a reason to go rather than a reason to wait.
Nobody minds a false alarm
Families delay because they fear wasting a doctor's time in the middle of the night. Emergency departments deal with bleeding in chemotherapy patients routinely, and a visit that turns out to be nothing is a good outcome rather than an embarrassment.
What to do next
Put the emergency list and both hospital numbers on the fridge today, and photograph them onto two phones. Switch to a soft toothbrush and an electric razor. Ask which single painkiller is safe for you. And decide now how you would get to hospital at two in the morning.
Commonly believed
Four beliefs that cost families hours
"We will see whether it stops by morning."
With a low platelet count bleeding may not stop on its own, and internal bleeding gives you no chance to watch it. The signs on this page need the same day, and most of them need the same hour.
"A headache is just a headache. I will take something for it."
With low platelets a severe or unusual headache can mean bleeding inside the head, and several common painkillers also affect platelets. Take nothing, and go. This applies after any knock to the head as well, even a minor one.
"Black stools are just from the iron tablets."
Iron does darken stools, which is exactly why this sign gets dismissed. Black tarry stools during chemotherapy must be assessed rather than explained away at home. Let a doctor decide which it is.
"They will think we are overreacting."
Emergency departments handle this routinely and nobody is irritated by a visit that turns out to be minor. The delay caused by worrying about it is a genuine risk; the false alarm is not.
Questions we are asked
Common questions about bleeding during chemotherapy
Which bleeding can wait until the next appointment?
Mild bleeding gums when brushing, or a small nosebleed that stops quickly with pressure, can usually be reported rather than rushed in. Everything on the warning list needs the same day. If in doubt, go.
How long should I press on a bleed?
A full ten minutes of firm continuous pressure without lifting to look, because lifting is what restarts it. For a nosebleed, pinch the soft part, sit upright and lean forward rather than tilting the head back.
Why does a head injury matter so much?
With a low platelet count, bleeding inside the head can develop slowly after a knock that seemed minor. Any head injury needs assessment the same day, even when the person feels completely well afterwards.
Can I take paracetamol for the headache on the way?
No. It can mask a fever, several painkillers affect platelets, and a severe headache with low platelets needs assessing rather than treating. Take nothing and go.
What about heavy periods during treatment?
Report them, and treat soaking through protection or passing large clots as needing the same day. This is frequently left unmentioned because it feels like a separate subject. It is not.
What should we do about the blood thinner?
Do not stop or change it yourselves, and tell the emergency team immediately that the patient takes one. It changes what they do first. Take the box with you.
How do we reduce the risk of bleeding at all?
A soft toothbrush, an electric razor rather than a blade, shoes indoors, care with knives and hot pans, treating constipation early rather than straining, and no contact sports. Small habits that prevent most avoidable bleeds.
Which hospital should we go to at night?
Ask your oncology team this in advance and write the answer on the fridge. Knowing the address before you need it saves the hour families most often lose. Call the oncology number from the vehicle, not before leaving.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
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Sources
- Cancer Research UK — Low platelet count
- Macmillan Cancer Support — Low platelet count
- National Cancer Institute — Chemotherapy and You
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.
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