17114 Hyperthermia Therapy

Overview

Hyperthermia therapy is a medical treatment that uses carefully controlled heat to warm part of your body. The heat is usually aimed at a tumour (an abnormal growth of cells) to help other treatments work better. The word 'hyperthermia' simply means 'high heat'. The aim is to raise the temperature of the target area to roughly 40–45°C — warm enough to make cancer cells weaker, but not hot enough to damage healthy tissue. It is done in hospital by a specialist team, and your temperature is watched closely the whole time. It is not the same as having a fever from an infection, or getting heat stroke on a hot day.

It is not a common treatment. Only some specialist centres offer it, and it is used for a limited number of cancers and situations. Many people have never heard of it, so it is normal to have lots of questions.

It is used in adults and, in some centres, in children. It may be offered to people with certain cancers — for example some tumours of the breast, cervix, bladder, rectum, skin, or cancer that has spread to the liver or the lining of the abdomen. It is also used for a small number of non-cancer problems. Whether it is suitable for you depends on where the problem is, your general health, and what other treatments you are having.

Symptoms

Common symptoms

• A warm or hot feeling in the treated area during the session
• Sweating and feeling flushed
• Redness of the skin, similar to mild sunburn
• Tiredness for a day or two afterwards
• Mild soreness or tenderness in the treated area
• Feeling thirsty or slightly light-headed afterwards

Symptoms in children

• Children may feel restless or frightened in the treatment room; a parent is often allowed to stay close by
• Young children may need light sedation so they can lie still
• Skin redness and tiredness can appear much the same as in adults
• Children lose heat and body fluid faster, so the team watches them more closely

Symptoms in older adults

• Tiredness may last longer than a couple of days
• A higher chance of feeling dizzy or dehydrated, especially in warm weather
• Skin may be more fragile, so redness or soreness can be more noticeable
• The team will check your heart and general health carefully before and during treatment

Causes

Main causes

• To make radiotherapy work better: heat can make cancer cells more sensitive to radiation
• To help chemotherapy reach the tumour: heat can improve blood flow in the treated area
• To damage cells directly: at higher temperatures, heat can harm cancer cells while healthy cells are better able to recover
• To ease symptoms in some advanced cancers, such as pain
• For a small number of non-cancer problems, such as certain long-term skin conditions

Risk factors

• Heart or blood vessel problems, including poor circulation
• High blood pressure that is not well controlled
• Metal implants, pacemakers, or other devices in or near the treated area
• Pregnancy
• Claustrophobia (fear of enclosed spaces), which can make lying in the equipment difficult
• Open wounds, infection, or very sensitive skin in the area
• Conditions that affect sweating or your ability to feel heat normally

When to see a doctor

See a doctor urgently if:

• You have a fever, chills, or feel generally unwell after a session
• Redness, blisters, or swelling appear and get worse
• You cannot keep fluids down or feel very dizzy
• Pain in the treated area becomes severe or suddenly changes

Book a routine appointment if:

• You feel more tired than usual for more than a few days
• You have questions about the plan or what happens next
• You feel anxious or low about treatment
• You notice small skin changes such as dryness, itching, or peeling

Diagnosis

Hyperthermia therapy is not a test — it is a treatment. Before it can be offered, your specialist team needs to know exactly where the problem is, how big it is, and whether you are well enough. This is worked out through a clinic appointment, a review of your scans, blood tests, and a check of your heart and general health. You will also talk through the possible benefits and risks, and you will be asked to give your consent before anything goes ahead.

Tests that may be done

• Imaging scans such as CT, MRI, or ultrasound to map the area to be treated
• Blood tests to check your general health and how well your kidneys and liver are working
• An electrocardiogram (ECG) — a tracing of your heart — and sometimes other heart tests
• A physical examination, including the skin over the treatment area
• A review of your other treatments and any implants or devices you have

What to expect at your appointment

You will usually have a planning session first, where the team works out the exact position and temperature. On treatment days you may be asked to wear loose clothing and to empty your bladder beforehand. Depending on the type, you might lie in a machine, sit in a special chair, or have a thin probe placed near the area. Small temperature sensors are taped to your skin. The team stays nearby and checks on you throughout. Most sessions take 30 minutes to 2 hours, and you can usually go home afterwards.

Treatment

There are three main ways heat is used — local, regional, and whole-body — and your team will explain which one suits you. Hyperthermia is nearly always combined with other treatment rather than used alone, and your temperature is monitored so the team can stop at any time.

Self-care at home

• Drink plenty of water before and after a session
• Wear loose, light cotton clothing over the treated area
• Rest when you feel tired — short naps are fine
• Keep the skin clean and gentle, and avoid hot baths, saunas, or heat pads on the treated area for a while
• Use a gentle, unperfumed moisturiser if the skin feels dry, unless your team says otherwise
• Avoid alcohol and heavy meals just before a session

Medical treatments

Hyperthermia is almost always part of a wider plan rather than a treatment on its own. Local hyperthermia warms a small, precise area using devices that apply energy from outside the body, or sometimes thin probes placed inside. Regional hyperthermia warms a larger area, such as an organ or a limb. Whole-body hyperthermia raises the whole body's temperature and is used only in specialist centres under very close monitoring. Heat is usually combined with radiotherapy or chemotherapy, and the timing is planned so the treatments help each other. Your temperature is measured continuously, and the team can stop at any point. Your specialist will explain the plan, the number of sessions, and how it fits with your other care.

When is surgery considered?

Hyperthermia itself is not surgery. Some techniques use thin probes placed inside the body, which may need a small procedure or a light sedative, but this is not the same as an operation. Surgery may be part of your overall treatment in other ways, and your team will explain whether that applies to you.

Living with this condition

Most people carry on with their usual routine between sessions, although you may need to plan for a quiet day afterwards. It helps to keep your treatment dates in a diary, note how you feel after each session, and tell your team about any changes. If you are travelling to a specialist centre, ask about help with transport and parking, and consider asking a friend or family member to come with you.

Lifestyle tips

• Keep a simple diary of side effects so you can describe them clearly at your next appointment
• Build rest into your week rather than waiting until you feel exhausted
• Ask for help with shopping, cooking, or childcare on treatment days
• Avoid very hot environments such as saunas, steam rooms, or long hot baths while your skin is sensitive
• Tell your team about any new medicines, supplements, or herbal remedies before you start them

Diet and exercise

Eating well and moving gently can help you cope with treatment. Try regular small meals with a mix of vegetables, fruit, beans, wholegrains, and protein, and sip water through the day. Gentle activity such as short walks, stretching, or light housework is usually helpful and can lift your mood — but build up slowly and rest when you need to. If you are losing weight or struggling to eat, ask your team to refer you to a dietitian.

Mental health and emotional wellbeing

Hearing about a new treatment, or living with a serious illness, can bring worry, low mood, and poor sleep. These feelings are very common and nothing to be ashamed of. Talking to someone — a partner, a friend, your treatment team, or a counsellor — really does help. If you ever feel you cannot cope, or have thoughts of harming yourself, contact your local emergency number or a crisis service in your country straight away, and tell your treatment team as soon as you can.

Prevention

Hyperthermia therapy is a treatment, not an illness, so there is nothing you can do to prevent needing it. What you can do is prepare well: keep to your appointments, tell your team about all your medicines and health conditions, stay well hydrated, and report side effects early. Many centres also suggest stopping smoking and getting support to eat well, as this helps you cope better with treatment.

Screening programmes

There is no screening test for needing hyperthermia therapy. Screening programmes do exist for some cancers, and your doctor can explain what is available in your area and whether it applies to you.

Complications

If left untreated

• The condition being treated may keep growing or cause more pain and symptoms
• Other treatments such as radiotherapy may work less well without the extra help that heat can give
• Side effects that are not reported can become harder to manage
• Rarely, poorly controlled heating can cause burns or heat-related illness — which is exactly why close monitoring matters

Long-term outlook

Hyperthermia therapy is an extra tool in treatment, not a last resort. For some cancers it has been shown to improve how well radiotherapy and chemotherapy work. Like all treatments, it helps some people more than others, and your specialist team will be honest with you about what to expect in your case. Many people tolerate it well and carry on with most of their daily life between sessions.

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