Hematologist
CION Cancer Clinics
Bleeding risk in APL: what families must know | CION Cancer Clinics
Bleeding is the main early danger in APL. The leukaemia cells use up platelets and clotting proteins, so bleeding can start suddenly in the brain, lungs or gut. A sudden headache, confusion, vomiting blood or bleeding that will not stop means the emergency department now, or call 108. This page explains why APL bleeds, the signs to watch and what the clotting tests mean. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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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
- Why does APL cause such dangerous bleeding?
- Where can bleeding show up, and which signs are hidden?
- What should the family do if bleeding starts?
- What do the clotting tests on the report mean?
- What do families believe about APL bleeding that is not true?
- What can this page not tell you about your family member?
- Common questions about bleeding in APL
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Bleeding with suspected or known APL: act now
Go to the nearest emergency department immediately or call 108 if there is a sudden severe headache, confusion, drowsiness, a fit, weakness on one side, vomiting blood, black or bloody stools, coughing blood, breathlessness, or bleeding that will not stop with firm pressure. Say the words "suspected APL" at the desk and show the blood report. Do not wait to see if it settles, and do not give painkillers such as aspirin or ibuprofen.
The short answer
Why does APL cause such dangerous bleeding?
APL upsets the whole clotting system, not just the platelet count. The abnormal cells release substances that switch on clotting all over the body and then break the clots down, so the blood runs out of what it needs to stop bleeding.
More than low platelets
Many blood cancers lower platelets, the small cells that plug a bleed. APL does that too. It also uses up fibrinogen and other clotting proteins, and it speeds up the breakdown of any clot that does form. Doctors call this coagulopathy, which simply means a problem with how blood clots. It is why a person with APL can bleed more than their platelet count alone would suggest.
When the risk is highest
The risk is greatest before treatment starts and in the first days and weeks after. As ATRA and arsenic trioxide make the abnormal cells grow up, they stop releasing these substances and the clotting tests slowly come back towards normal. Until the team says the tests have settled, treat any new bleeding as urgent.
Clots can happen too
Less often, the same process causes clots, for example a swollen painful leg or sudden chest pain. These are also emergencies and should be reported at once.
Not sure whether this applies to you?
Ask an oncologistWhat to look for
Where can bleeding show up, and which signs are hidden?
Some bleeding is easy to see. The most dangerous kind often is not. Families at the bedside are often the first to notice a change.
On the skin and in the mouth
New bruises, tiny red or purple dots, bleeding gums, oozing from a drip site or a nosebleed that keeps going. These need telling to the nurse or doctor the same hour.
Inside the head
This is the bleeding that causes the most harm, and it gives few visible clues.
Signs to act on
- Sudden or worsening headache
- Confusion or unusual sleepiness
- Blurred vision or slurred speech
- Weakness or a fit
In the lungs and gut
Coughing blood, new breathlessness, vomiting blood or material like coffee grounds, or black, tarry stools.
In women
Periods that are much heavier or longer than usual. Tell the team, because they may want to control periods during the early weeks of treatment.
At the bedside or at home
What should the family do if bleeding starts?
Get help straight away
In hospital, press the call bell and tell the nurse exactly what you saw. At home, call 108 or go to the nearest emergency department. Do not drive a person who is confused or drowsy yourself if an ambulance can come.
Press, do not probe
For a nosebleed, sit upright, lean forward and pinch the soft part of the nose firmly. For a cut or drip site, press with a clean cloth. Do not keep lifting it to check.
Take the reports
Carry the latest blood count, clotting tests and the discharge or treatment sheet. The receiving doctor needs to know this is APL, not an ordinary bleed.
Avoid the common mistakes
No aspirin, ibuprofen or other painkillers without the team's advice. No intramuscular injections from a local clinic. No stopping or skipping any APL medicine on your own.
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On your report
What do the clotting tests on the report mean?
Reference ranges differ between laboratories. A single result is read alongside symptoms and repeat tests, never on its own.
- Platelet count
- How many clotting cells are in the blood. In APL the team keeps it higher than they might for other leukaemias.
- Fibrinogen
- A clotting protein that APL uses up fast. A low result is one of the most important warning signs.
- PT and INR
- How long blood takes to clot. A longer time means clotting proteins are running low.
- aPTT
- Another clotting time test, checking a different set of clotting proteins.
- D-dimer
- A marker of clots being broken down. It is often very high in untreated APL.
- Cryoprecipitate
- A blood product rich in fibrinogen, given to replace what has been used up.
Commonly believed
What do families believe about APL bleeding that is not true?
"His platelets are not that low, so bleeding is unlikely."
In APL, clotting proteins can be badly depleted even when platelets look acceptable. The team looks at fibrinogen and clotting times as well. Treat any new bleeding sign as urgent, whatever the last platelet number was.
"A headache is just stress from being in hospital."
It may be. But in early APL a new or worsening headache must be reported immediately, because bleeding in the brain can start this way. Let the doctor decide whether it needs a scan.
"Blood transfusions will fix the problem."
Transfusions buy time and replace what is lost. The underlying cause is the APL cells. That is why ATRA and arsenic trioxide are started as early as possible alongside the blood products.
"Home remedies like papaya leaf juice will raise platelets."
There is no good evidence these help in APL, and they do nothing for the clotting proteins that are being used up. Do not let them delay hospital care, and tell the team about anything you give.
Being straight with you
What can this page not tell you about your family member?
This page cannot tell you how high the bleeding risk is for one person today. That depends on the latest clotting tests, the white count, how long treatment has been running and how the person looks at the bedside. Only the treating team has all of that in front of them.
How long the risk lasts
For most people the clotting tests improve over the first weeks of treatment. The team will tell you when they are comfortable that the highest risk has passed. Ask them directly, because it changes what you should watch for at home later.
Who needs extra care
A very high white count at diagnosis, older age, a recent fall or injury, pregnancy, and liver or kidney problems can all add to the risk. Tell the team about any of these, and about every medicine and supplement being taken.
Where CION fits
CION's haematology team can review reports and explain what the clotting results mean. Early APL bleeding is managed where the patient is admitted, with blood products on hand. A review never replaces going to the emergency department.
Questions we are asked
Common questions about bleeding in APL
Can a person with APL bleed to death?
Serious bleeding, especially in the brain or lungs, is the main early danger in APL and can be life-threatening. That is why treatment starts on suspicion, blood products are given, and patients are watched closely in hospital. Once the clotting tests settle, this risk falls a great deal.
Why does the doctor keep ordering platelets and plasma?
APL uses up platelets and clotting proteins faster than the body can make them. Platelets, plasma and cryoprecipitate replace what is lost while ATRA and arsenic treat the cause. The amounts are guided by repeated tests, so the orders can change more than once a day.
We cannot find donors. What can the family do?
Ask the hospital blood bank what it needs. Many banks ask relatives and friends to donate to replace stock, even if their blood group is different. Voluntary donor groups in Hyderabad and district towns can also help. Start early, because the need can continue for days.
Is it safe to brush teeth or shave?
In the early weeks, use a very soft toothbrush or the mouth care the nurses advise, and an electric razor rather than a blade. Avoid flossing and blowing the nose hard. Ask the team when normal routines can return, because it depends on how the counts recover.
Can APL also cause blood clots?
Yes, less often than bleeding. The same upset clotting system can form clots in the legs, lungs or elsewhere. A painful swollen leg, sudden chest pain or sudden breathlessness should be reported straight away. Never start or stop a blood thinner without the team's instruction.
Can we give paracetamol for headache or fever?
Ask the treating team first. A new headache or fever in early APL needs a doctor to see it, because either can signal a serious problem. Aspirin and ibuprofen should be avoided because they affect clotting. Never give any medicine to hide a symptom before it has been reported.
Does bleeding at diagnosis change the outlook?
Serious bleeding early on is one of the things that can affect how APL goes, which is why so much effort goes into preventing it. Many people with bruising or gum bleeding at diagnosis do well once treatment starts. Ask your haematologist what the early results mean in your case.
When can the patient safely travel home?
Only when the team says the clotting tests have settled and it is safe. Long road journeys to a district home early in treatment can be risky if bleeding starts far from a hospital. Ask where the nearest emergency department is on your route and at home before leaving.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
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
- American Cancer Society — Treating Acute Promyelocytic (M3) Leukemia
- National Cancer Institute — Adult Acute Myeloid Leukemia Treatment (PDQ) - Patient Version
- NHLBI — Disseminated Intravascular Coagulation
- NHS — Acute myeloid leukaemia
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
Why APL Is Treated Before the Diagnosis Is ConfirmedHow early ATRA reduces the bleeding riskAPL: The Most Curable Leukaemia and the Most UrgentThe basics of APLDifferentiation Syndrome: A Reaction to Watch ForThe other early complication to watchBlood counts during chemotherapyUnderstanding platelet and blood count reports
Talk to us
Worried about clotting results?
If there is bleeding now, go to the emergency department first. For questions about reports, CION's haematology team can help. One helpline serves every CION centre.