Understanding Radiotherapy: What to expect from your first session.

If you have been told you need radiotherapy, it is normal to feel uncertain before the first appointment. Many people in Singapore hear the word and immediately think of serious side effects or a painful procedure, but the first session is usually more structured and less dramatic than expected. Radiotherapy, also called radiation therapy, uses carefully targeted high-energy radiation to treat cancer and, in some cases, to relieve symptoms caused by tumours. For many patients, the biggest worry is not the treatment itself, but the unknowns around preparation, positioning, safety, and what the body will feel like afterward.

In Singapore, radiotherapy is delivered in both public and private specialist settings, typically under the care of radiation oncologists, medical physicists, radiation therapists, nurses, and other cancer care professionals. The treatment plan is individualised, which means your first session is designed around your diagnosis, the area being treated, and the exact dose your doctor has prescribed. Knowing what happens before, during, and after that first visit can make the experience less intimidating and help you prepare practically, whether you are arranging leave from work, coordinating transport with family, or planning meals around treatment days.

What radiotherapy is and why the first session matters

Radiotherapy uses controlled beams of radiation to damage the DNA of cancer cells. DNA is the genetic material that tells cells how to grow and divide. Cancer cells are generally less able than normal cells to repair this damage, so radiotherapy can slow, stop, or destroy them. Depending on the cancer type and stage, radiotherapy may be used on its own, before surgery, after surgery, or together with chemotherapy or targeted therapy. It may also be used palliatively, which means to relieve symptoms such as pain, bleeding, or pressure from a tumour.

The first session matters because it confirms that the treatment setup is accurate and reproducible. Radiotherapy works best when the machine can target the same region in the same way across multiple sessions. That is why planning, marking, imaging, and positioning are so important. A treatment course may involve many visits, but the first one often feels like the most technical because the team is checking that everything matches the plan created earlier.

Planning usually happens before treatment day

Many patients assume the first session starts with the machine turning on immediately. In reality, most of the preparation happens beforehand during a planning appointment, often called simulation. During this visit, the team may use a CT scan to map the area to be treated. CT stands for computed tomography, a detailed imaging test that creates cross-sectional pictures of the body. These images help the radiation oncologist and dosimetrists, the specialists who help design the dose distribution, determine the safest and most effective angles for treatment.

Depending on the site being treated, you may be given a customised immobilisation device, such as a mask for head and neck treatment, or a moulded support for the legs, chest, or abdomen. These devices are not meant to restrain you. They help keep your body still so the beam can be aimed accurately. In Singapore, where treatment centres manage many patients daily, these standardised planning steps are part of established practice and are essential for precision.

How to prepare for your first radiotherapy session

Preparation is often more practical than medical. Your team will usually give specific instructions based on the treatment site, and following them closely helps the session go smoothly. Some treatments do not need much special preparation, while others may require a full bladder, an empty bowel, or a particular skin routine. If you are unsure, check your instruction sheet or call the clinic before treatment day rather than guessing.

What to bring with you

Bring your appointment letter, identification documents, any referral paperwork if requested, and a list of current medications. If you take blood thinners, diabetes medication, or steroids, it is important that the team knows. In Singapore, many patients juggle treatment with work and family responsibilities, so it can help to bring a water bottle, a light snack if allowed, and something to occupy waiting time, such as a phone charger or reading material. If the treatment area is on the chest, neck, or abdomen, wearing loose clothing can make changing easier.

Skin care and personal routines

For some treatment areas, especially where the beam passes through skin folds or areas that receive repeated exposure, skin care instructions matter. The team may advise you not to apply creams, perfumes, deodorants, or talcum powder on the treatment area before the session, depending on the centre’s protocol and your individual plan. This is not because radiotherapy is dirty or dangerous, but because certain products can interfere with accurate positioning or skin assessment. If your doctor recommends a specific moisturiser, use it exactly as directed. Do not start random over-the-counter products without checking with the care team.

If you are treated at a hospital in Singapore and plan to return to work after the session, consider scheduling on days when your energy demands are lower. Some people feel physically well enough to continue normal routines, while others prefer to rest after treatment, especially if they have already had surgery or are also receiving chemotherapy.

What happens during the first session

The first treatment visit usually begins with registration and a wait before the radiotherapy team calls you in. You may meet radiation therapists, who are trained professionals responsible for positioning you, operating the machine, and making sure the treatment follows the prescription. They are not the same as radiation oncologists, who are doctors specialising in cancer treatment and who design and oversee the overall plan.

Positioning is precise and deliberate

Once in the treatment room, you may be asked to change into a gown or remove clothing from the treatment area. The team will position you on the treatment couch using reference marks, lasers, or the immobilisation device made during planning. You may hear instructions such as take a deep breath and hold it, especially for some breast or chest treatments where breath control helps protect the heart and lungs. If so, the team will practise with you first so you know what to do.

The machine, often called a linear accelerator, may move around you. It does not usually touch you, though the table may shift slightly during setup. The room can feel cold and clinical, but the staff will leave the room only while the radiation is being delivered. They monitor you closely through cameras and an intercom. The treatment itself is painless. You do not feel, see, or smell the radiation beam during delivery.

Imaging may be part of the session

Before the beam is delivered, the team may take verification images. These images confirm that your position matches the treatment plan. Verification imaging is a standard safety step, not a sign that something has gone wrong. In some centres, the first session may take longer because the team checks alignment carefully. This is normal and should not be interpreted as a problem. Accuracy on the first day helps the rest of the course proceed more efficiently.

For many patients, the actual radiation delivery is only a few minutes. The overall appointment, however, may take longer because of preparation, setup, and confirmation checks. If you are attending after commuting by MRT or bus, or after driving from home, allow extra time so you are not rushed. Being calm and unhurried helps the session proceed smoothly.

How you may feel during and after the first treatment

Most people do not feel anything unusual while the radiation is being delivered. There is no burning sensation from the beam itself. If you feel discomfort, it is more likely related to lying still, tension in the body, or the treatment position. Tell the staff if you are in pain or cannot maintain the posture required. Small adjustments can sometimes be made to improve comfort without compromising accuracy.

Immediate side effects are usually mild or absent

Many side effects from radiotherapy are not immediate. They often develop gradually over days or weeks, depending on the treatment area and total dose. Common effects can include fatigue, skin redness or dryness in the treated area, soreness of the mouth or throat if the head and neck are treated, or changes in bowel or bladder habits if the pelvis is treated. These reactions depend on where radiation is directed. A person receiving treatment to the breast will not usually experience the same side effects as someone receiving treatment to the abdomen or brain.

Fatigue is one of the most common effects and is often described as tiredness that rest does not fully fix. It can build up over the course of treatment. In Singapore, where many people continue working, caring for children, or supporting elderly parents, this can be challenging. Planning lighter duties, asking for flexible work arrangements if possible, and prioritising sleep can help manage energy better. If fatigue becomes severe or interferes with daily function, tell your treatment team.

When to contact the clinic

You should contact your radiotherapy team if you develop fever, worsening pain, severe skin reactions, difficulty swallowing, vomiting, diarrhoea, shortness of breath, or symptoms that feel out of proportion to what you were told to expect. Treatment teams prefer early contact rather than waiting for the next appointment. If the symptom is urgent, seek immediate medical care through the appropriate emergency service. General information about side effects should never replace direct advice from your own oncologist or treatment centre.

Practical tips for Singapore patients starting radiotherapy

Radiotherapy is medical treatment, but it is also part of daily life. In Singapore, many patients need to balance appointments with commuting, caregiving, and work demands. Small planning steps can make a real difference. If your appointment is at a major hospital campus, factor in walking distance, security checks, and time needed to locate the correct clinic. If you depend on someone else for transport, agree on pickup and drop-off timing before treatment day.

Work, family, and daily routines

If you are employed, discuss your schedule with your employer early if possible. Some people can work before or after treatment, especially in the early stages, but others may need short-term leave or reduced hours. If you are caring for children or older relatives, ask family members to help on treatment days, particularly if the first few sessions are likely to take longer. Having support does not mean you are unable to cope, it means you are creating the space needed for safe, steady treatment.

Food is another practical consideration. Many Singaporeans are used to hawker meals, but some treatment side effects may affect appetite, swallowing, or bowel habits. If your treatment area could affect eating, ask your team what textures and foods are best. For some patients, softer foods, soups, or smaller meals are easier to manage during the course of treatment. Hydration is also important, especially if you are told to come with a full bladder for certain scans or sessions.

Questions worth asking your team

It helps to ask clear questions before your first session. Useful examples include, how long will each session take, should I eat before treatment, can I drive afterward, what skin care products are safe, and which side effects should prompt a call to the clinic. If you take traditional or herbal supplements, mention them as well. Some products may interact with cancer treatment or affect liver function, bleeding risk, or general wellbeing. Your team can advise you based on your full treatment plan.

What to remember after the first visit

The first radiotherapy session is usually about setup, accuracy, and reassurance. It does not always reflect how you will feel for the rest of treatment, and it does not necessarily predict the full range of side effects. Some patients leave the first session feeling relieved because the unknown is finally behind them. Others feel tired, emotionally drained, or still anxious, which is also normal. What matters most is staying in communication with your treatment team and reporting new symptoms early.

Radiotherapy is a carefully planned therapy carried out by trained professionals with the goal of helping control cancer or ease symptoms while minimising harm to normal tissue. If you are starting treatment in Singapore, use the first session as a chance to ask questions, confirm instructions, and understand your own routine. Bring support if you need it, follow the preparation guidance closely, and give yourself permission to rest when the body asks for it. If anything about the treatment feels unclear, ask the team directly, because good cancer care depends on informed patients and open communication throughout the entire course of treatment.