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Heart and thyroid checks after radiotherapy for Hodgkin lymphoma | CION Cancer Clinics
After radiotherapy to the chest or neck for Hodgkin lymphoma, you need a thyroid blood test at least once a year and regular heart checks for life. The thyroid often becomes underactive over time, and the heart's vessels, valves and muscle can be affected years later, often without symptoms. Both can be found early. Chest pain or sudden breathlessness needs emergency care the same day. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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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 do you need heart and thyroid checks after Hodgkin radiotherapy?
- How can chest radiotherapy affect the heart?
- What does thyroid follow-up involve?
- What do the words on the heart and thyroid reports mean?
- Who needs closer checks, and what can you do yourself?
- What do survivors often believe about these checks?
- Common questions about heart and thyroid follow-up
The short answer
Why do you need heart and thyroid checks after Hodgkin radiotherapy?
Radiotherapy to the chest or neck can slowly affect the heart and the thyroid gland, sometimes many years later. You need a thyroid blood test at least once a year and regular heart checks for life, because both problems can be found early and treated.
What the thyroid check looks for
The thyroid is a small gland at the front of the neck. It sets how fast your body uses energy. Radiotherapy to the neck often makes it underactive over time. That causes tiredness, weight gain, feeling cold and low mood. It is one of the most common late effects of Hodgkin treatment, and it is simple to treat once found.
What the heart check looks for
Radiotherapy to the middle of the chest can narrow the heart's blood vessels, stiffen the valves or scar the lining around the heart. Doxorubicin, one of the medicines in ABVD chemotherapy, can also weaken the heart muscle. These changes often cause no symptoms for years, which is why checks matter even when you feel well.
Today's radiotherapy uses smaller areas and lower doses than in the past, so the risk is lower for people treated recently. It is not zero.
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Chest pain cannot wait
If you had chest radiotherapy and get chest pain or pressure, pain spreading to the arm, jaw or back, sudden breathlessness, or fainting, call 108 or go to the nearest emergency department now. Tell them you had radiotherapy to the chest for Hodgkin lymphoma. Heart problems after radiotherapy can appear at a younger age than people expect, so do not assume you are too young.
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Ask an oncologistInside the chest
How can chest radiotherapy affect the heart?
Each part of the heart can be affected in a different way. Your checks are chosen to find each one.
Narrowed blood vessels
The arteries that feed the heart can narrow earlier than usual. This can lead to chest pain on effort or a heart attack.
Found by
- ECG and stress testing
- Sometimes a CT of the heart arteries
Stiff or leaky valves
The valves that keep blood moving one way can thicken over time. You may notice breathlessness or swollen ankles, or a doctor may hear a new murmur.
Weaker heart muscle
More likely if you also received doxorubicin. The heart pumps less strongly, causing breathlessness and tiredness.
Found by
- An echocardiogram, an ultrasound of the heart
Lining and rhythm problems
The sac around the heart can scar, and the heart's electrical system can be affected, causing a slow or irregular beat.
Palpitations or dizzy spells deserve a check, not reassurance by phone.The thyroid
What does thyroid follow-up involve?
A yearly blood test
A simple blood test measures TSH, the hormone that tells the thyroid to work harder. Your team may check it more often if results start to change.
Reading the result
A rising TSH usually means the thyroid is slowing down. Reference ranges differ between laboratories, and one result is read with your symptoms and a repeat test.
Treatment if needed
An underactive thyroid is treated with a daily hormone tablet. Your doctor sets and adjusts it with blood tests. Do not change it on your own.
A neck examination
A doctor feels the neck for lumps. Radiotherapy also slightly raises the chance of thyroid nodules and thyroid cancer, so report any new lump promptly.
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On your report
What do the words on the heart and thyroid reports mean?
- TSH
- Thyroid stimulating hormone. A high level usually means the thyroid is underactive.
- Free T4
- The main hormone the thyroid makes. A low level supports an underactive thyroid.
- Hypothyroidism
- The medical name for an underactive thyroid.
- ECG
- A quick tracing of the heart's electrical activity, taken with stickers on the chest.
- Echocardiogram (echo)
- An ultrasound of the heart that shows how well it pumps and how the valves work.
- Ejection fraction
- How much blood the heart pushes out with each beat. A lower figure means weaker pumping.
- Lipid profile
- A blood test for cholesterol and other fats that affect the heart's blood vessels.
Your part
Who needs closer checks, and what can you do yourself?
Your risk is higher if you had radiotherapy to the middle of the chest, if you were young at treatment, or if you also had doxorubicin. It is lower if you had chemotherapy only. Your treatment summary tells your team which group you are in.
Look after the risks you can change
Do not smoke or chew tobacco. Get your blood pressure, blood sugar and cholesterol checked regularly, and keep them under control with your doctor's help. Stay active and keep a healthy weight. These steps matter more for a survivor than for someone who never had radiotherapy.
Tell every new doctor
A cardiologist, physician, anaesthetist or gynaecologist may not know your history. Tell them you had chest radiotherapy and which chemotherapy. If you plan a pregnancy, mention it early, because the heart works harder then.
What this page cannot tell you
It cannot set your own schedule of heart tests. That depends on your radiotherapy area, the medicines you received and your other health. At CION, the haematology team plans follow-up from your records and involves a cardiologist where needed.
Commonly believed
What do survivors often believe about these checks?
"I feel fine, so my heart must be fine."
Radiotherapy damage to the heart often causes no symptoms until it is advanced. Regular checks find changes while they are still easier to manage.
"The tiredness is just what life after cancer feels like."
Tiredness, weight gain and feeling cold can all be an underactive thyroid. A simple blood test can tell, and treatment often helps a great deal.
"Once I start the thyroid tablet, I can stop the checks."
The tablet often needs adjusting over the years. Blood tests show whether the amount is still right, so keep going for them.
"Heart problems only happen in old age."
After chest radiotherapy, heart disease can appear decades earlier than usual. Being young does not rule it out.
Questions we are asked
Common questions about heart and thyroid follow-up
How many years after radiotherapy can heart problems start?
They often appear many years later, commonly more than a decade after treatment, and the risk continues to rise with time. That is why heart follow-up is for life. Some problems, such as inflammation of the heart lining, can appear sooner. Report any new chest symptom whenever it happens.
I had only chemotherapy. Do I still need heart checks?
Possibly. Doxorubicin, part of ABVD, can weaken the heart muscle even without radiotherapy. Your team decides whether you need an echocardiogram and how often, based on the medicines you had and your other risks, such as blood pressure or diabetes.
Does neck radiotherapy always affect the thyroid?
No. Many people keep normal thyroid function. The chance is higher when the neck received radiotherapy, and it can take years to show. Because it is common and easy to miss, a yearly blood test is the usual approach, rather than waiting for symptoms.
Can I skip the thyroid tablet when I feel well?
No. Feeling well usually means the tablet is working. Stopping it on your own lets the tiredness and other symptoms return slowly. If you have side effects or doubts, talk to your doctor, who can check your blood level and adjust it safely.
Which doctor should do these checks?
Usually your haematologist or a survivorship clinic leads, with your family physician helping between visits. A cardiologist joins if a heart test shows a change. What matters most is that one doctor holds your full treatment history and keeps the schedule going.
Is it safe to exercise after chest radiotherapy?
For most people, regular activity is good for the heart. If you have not been active for a while, or have had chest pain, breathlessness or a heart finding, ask for a check before starting hard exercise. Stop and seek help if exercise brings on chest pain.
Are these checks covered by insurance or Aarogyasri?
It depends on your scheme and policy. CION accepts Aarogyasri, CGHS, ECHS, EHS and PM-JAY, and most cashless insurers. Follow-up tests are not always covered, and scheme rules change. Call the helpline with your card details and the team will check your current cover.
My treatment was years ago and nobody mentioned this. What now?
It is not too late to start. Book a review, bring any old records you have, and ask for a thyroid blood test and a heart assessment. Many survivors treated years ago were never told about late effects. Starting checks now still helps find problems early.
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Sources
- National Cancer Institute — Late Side Effects of Cancer Treatment
- American Cancer Society — Living as a Hodgkin Lymphoma Survivor
- NHS — Underactive thyroid (hypothyroidism)
- NHS — Hodgkin lymphoma
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
Second Cancer Risk After Hodgkin TreatmentThe other long-term risk that needs regular checksRadiotherapy in Hodgkin Lymphoma TodayHow modern radiotherapy limits heart and thyroid exposureABVD Chemotherapy: What to ExpectThe combination that includes doxorubicinRadiation therapy guideHow radiotherapy works and its side effects
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Not sure which checks you need?
Bring your treatment records. CION's haematology team will review them and plan heart and thyroid follow-up that fits your history. One helpline serves every CION centre.