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Acute chest syndrome: warning signs that cannot wait | CION Cancer Clinics
In sickle cell disease, chest pain, a new cough, fever, fast breathing or breathlessness can be the warning signs of acute chest syndrome, a lung emergency. Go to the nearest emergency department now, or call 108. It can worsen within hours, and early treatment makes a real difference. This page lists the signs in adults and children, and explains what the hospital will do. At CION Cancer Clinics, our haematology team supports patients and families through treatment, cost questions and life at home.
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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
- What are the warning signs of acute chest syndrome?
- How does acute chest syndrome show itself?
- What will the hospital do?
- What do the words on the report mean?
- Which beliefs make families wait too long?
- Who is at higher risk, and what can this page not tell you?
- Common questions about acute chest syndrome
Do this first
What are the warning signs of acute chest syndrome?
In someone with sickle cell disease, chest pain, a new cough, fever, fast breathing or breathlessness are warning signs of acute chest syndrome. Go to the nearest emergency department now, or call 108. Do not wait to see whether it settles with rest.
What acute chest syndrome is
It is a lung emergency that happens in sickle cell disease. Stiff, curved red cells block small blood vessels in the lungs, and infection or trapped fat from the bone marrow can add to the damage. Part of the lung stops taking in oxygen properly. On an X-ray it can look like pneumonia, and the two often happen together.
Why it needs speed
Acute chest syndrome can move from a mild cough to serious breathing trouble quickly. It is one of the most common reasons people with sickle cell disease need intensive care. Treated early, most people recover. The danger lies in delay, especially at night or when the hospital is far away.
It often starts during or just after an ordinary pain crisis, or a few days after surgery. Watch the breathing closely at those times.
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Call 108 now for these
Struggling to breathe, breathing very fast, unable to finish a sentence, lips or fingertips turning blue or grey, drowsiness or confusion, or chest pain with fever. If you have a pulse oximeter at home and the reading is lower than usual, go in, but never let a normal reading talk you out of going when the person looks unwell. Tell the crew the person has sickle cell disease.
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Ask an oncologistWhat to look for
How does acute chest syndrome show itself?
Not everyone gets every sign. One of them, in someone with sickle cell disease, is enough to be seen the same day.
Chest pain
Pain in the chest, ribs or upper back, which may be sharp and worse on breathing in. Sometimes it starts as bone pain in the chest wall during a pain crisis.
Breathing changes
Breathing faster than usual, feeling short of breath, noisy breathing, or needing to sit up to breathe. Shallow breaths because deep ones hurt are also a warning.
In children look for
- Ribs pulling in with each breath
- Nostrils flaring
- Grunting or unusual sleepiness
Fever and cough
A new cough, with or without fever, can be the first sign. In young children fever and cough are often the only signs, without much chest pain at all.
Looking unwell in a way that is new
Unusual tiredness, poor feeding in a baby, confusion, or a pale or bluish colour. Families often notice this before any doctor does. Trust that feeling.
At the hospital
What will the hospital do?
Check oxygen and the chest
A clip on the finger measures oxygen. A chest X-ray looks for a new shadow in the lung. Blood tests check the haemoglobin (the part of blood that carries oxygen) against your usual level.
Oxygen and pain relief
Oxygen is given if the level is low. Pain is treated so the person can breathe deeply, because shallow breathing lets more of the lung close down.
Antibiotics and breathing exercises
Antibiotics cover a possible chest infection. You may be given a small plastic device to blow into, which helps keep the lungs open.
Transfusion if it is worsening
If oxygen stays low or the X-ray worsens, the team may give blood, or swap some of the sickle blood for donor blood. Serious cases move to intensive care.
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On the discharge summary
What do the words on the report mean?
- ACS
- Short for acute chest syndrome, the lung emergency described on this page.
- Infiltrate or consolidation
- A new white patch on the chest X-ray, where part of the lung is filled with fluid or inflammation instead of air.
- SpO2 or oxygen saturation
- How much oxygen the blood is carrying, read from the finger clip. A drop from your usual reading matters more than any single number.
- Incentive spirometry
- Breathing exercises with a small device that helps you take slow, deep breaths to keep the lungs open.
- Exchange transfusion
- Some of your blood is removed and replaced with donor blood, to lower the share of sickle cells quickly.
- Anaemia
- A low haemoglobin. Reference ranges differ between laboratories, and a single result is read alongside symptoms and repeat tests.
Commonly believed
Which beliefs make families wait too long?
"It is only a cold. Steam and rest will do."
In sickle cell disease a cough with fever or chest pain cannot be treated as an ordinary cold. It needs a chest examination and often an X-ray the same day, because it can turn into acute chest syndrome.
"The chest pain is just part of the pain crisis."
It may be, but chest pain during a crisis is exactly how acute chest syndrome often begins. Only a doctor who examines the chest and checks the oxygen can tell the difference.
"The oximeter reading is fine, so the lungs must be fine."
A home reading can be normal early on, or wrong if the hands are cold. If the person is breathing fast, in pain or looks unwell, go to hospital whatever the number says.
"Once he has had it and recovered, it will not come back."
Having acute chest syndrome once makes another episode more likely, not less. Ask your haematologist what longer-term treatment could lower that risk.
Being straight with you
Who is at higher risk, and what can this page not tell you?
Anyone with sickle cell disease can develop acute chest syndrome. It is seen more often in young children, in people who have had it before, in those with asthma, and in the days after surgery or a general anaesthetic. Smoking and second-hand smoke in the home add to the risk.
After a hospital stay
Ask the team before discharge what signs should bring you straight back, and whether a follow-up with a haematologist is booked. Longer-term treatments, including hydroxyurea and planned transfusions, are sometimes discussed after an episode. Whether either suits you is a decision for your haematologist. They do not suit everyone, and this page gives no doses. Never start, stop or change a medicine on your own.
What this page cannot tell you
It cannot tell whether a particular cough or chest pain is acute chest syndrome. Only an examination, oxygen check and X-ray can. It cannot predict how one person's episode will go. If you are reading this while someone is struggling to breathe, stop reading and go.
CION's haematology team can review discharge reports afterwards and help plan follow-up with you.Questions we are asked
Common questions about acute chest syndrome
How quickly can acute chest syndrome get worse?
It can worsen within hours, sometimes faster than families expect. A mild cough in the evening can become serious breathing trouble by morning. That is why the advice is to go to an emergency department as soon as a warning sign appears, rather than waiting overnight or until a clinic opens.
Is acute chest syndrome the same as pneumonia?
Not quite. Both show a new patch on the chest X-ray and both can cause fever and cough. In acute chest syndrome, blocked blood vessels in the lung play a large part, and infection may or may not be present. Doctors often treat for both, which is why antibiotics are usually started.
My child only has a fever and cough. Is that enough to go?
Yes. In young children with sickle cell disease, fever and cough are often the only early signs, with little chest pain. Fever on its own also needs same-day care because of the infection risk. Take the child to an emergency department and say they have sickle cell disease.
Should we buy a pulse oximeter for home?
It can help, if you know your usual reading and understand its limits. Readings can be wrong with cold hands, nail polish or poor fit. Use it as one extra clue, never as a reason to stay home when breathing looks hard. Ask your haematologist whether it is useful for your family.
Will a blood transfusion always be needed?
No. Milder episodes may settle with oxygen, pain relief, antibiotics and breathing exercises. A transfusion, or an exchange transfusion, is considered when oxygen stays low, the X-ray worsens, or the haemoglobin falls well below the person's usual level. The treating team decides, weighing benefits against risks.
Can breathing exercises prevent it?
They can lower the risk during a pain crisis or after surgery, because deep breaths keep the lower lungs open. They are not a substitute for hospital care once warning signs appear. Ask the ward team to show you how to use the breathing device before you go home.
Can adults get acute chest syndrome, or only children?
Adults get it too, and in adults it is often more severe, with more chest pain and a greater chance of needing intensive care. Adult children caring for a parent with sickle cell disease should watch for the same warning signs and act just as quickly.
What should I ask the haematologist after an episode?
Ask what likely triggered it, whether longer-term treatment could reduce another episode, whether a written emergency plan can be made, and what signs mean coming straight back. Ask how asthma or any smoke exposure at home should be handled. Keep the discharge summary for every future visit.
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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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Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. A haematology consultation can be booked at any of these centres through one helpline, and your team will tell you where each test or treatment takes place.
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Sources
- NHS — Sickle cell disease
- National Heart, Lung, and Blood Institute — Sickle Cell Disease
- American Society of Hematology — Sickle Cell Disease
- National Health Mission — National Sickle Cell Anaemia Elimination Mission
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
Sickle Cell Crisis: When to Go to HospitalEvery crisis sign that means going in todayVery Low Haemoglobin: When It Is an EmergencyWhen a sudden drop needs urgent transfusionSuspected Pulmonary EmbolismAnother cause of sudden chest pain and breathlessnessEmergency Card for Blood Disorder PatientsA card to carry so the emergency team knows at onceBenign Haematology EmergenciesEvery blood disorder emergency in one place
Talk to us
Recovering from acute chest syndrome?
In an emergency, go to the nearest emergency department or call 108 first. Afterwards, share the discharge summary with our helpline and the haematology team will help plan follow-up.