Medical Oncologist
Exercise and activity
Swimming during chemotherapy
Usually not while a port or line is in place, not when your white cells are low, and not if your skin is broken anywhere. Between those windows, with your team's agreement, a clean well-maintained pool is reasonable for some patients. Lakes, rivers, tanks and the sea are best avoided for the whole course.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Can you swim during chemotherapy?
Usually not while a port or a line is in place, not when your white cells are low, and not if your skin is broken anywhere. Between those windows, with your team's agreement, a clean well-maintained pool is reasonable for some patients. Lakes, rivers, tanks and the sea are a different matter and are generally best avoided for the whole course.
Swimming is worth asking about rather than assuming, because it is gentle on the joints and many patients find it the easiest exercise to manage. The reason for caution is infection through the skin and through the water rather than the exertion.
A port or line usually settles the question
The dressing and the entry site must stay dry and clean, and immersing them is exactly what a pool does. Ask what applies to your own device and for how long.
Low counts mean stay out
Even a clean pool carries organisms, and low white cells are the whole reason to care. Swim in the recovered week if you swim at all, and ask which days those are.
Any break in the skin means stay out
A healing wound, a crack between the toes, a sore on the hand, a radiotherapy-treated area or an unhealed biopsy site. Water finds broken skin, and broken skin is how infection gets in.
Ask your oncologist specifically. This is one of the few activity questions where the answer is frequently no.When to stay out
The situations where swimming is not a good idea
- While a port, a line or a drain is in place
- The site has to stay dry and clean, and an infection reaching a central line is a serious event. Ask when the device comes out and whether swimming is allowed afterwards.
- When white cells are low
- Pools, however clean, carry organisms, and the point of caution is precisely a weakened defence against them. Ask which days of your cycle those are before planning anything.
- With any broken skin
- Wounds, cracked skin on the hands or feet, sores, unhealed biopsy sites and treated radiotherapy skin. All of these are entry points, and several are common during chemotherapy.
- In lakes, rivers, tanks and the sea
- Untreated water carries a far wider range of organisms than a chlorinated pool. Generally best left alone for the whole course regardless of how your counts are behaving.
- If you have had diarrhoea recently
- Both for your own sake and everybody else's. Wait until well clear of it, and if diarrhoea has been persistent, report it rather than planning a swim.
- If you are unsteady, faint or very tired
- Water is an unforgiving place to feel faint. Never swim alone during treatment, and stay out entirely if dizziness has been a problem.
Not sure whether this applies to you?
Ask an oncologistPractical
If your team says yes
The precautions are simple and they are the whole point.
Choose a well-maintained pool, at a quiet hour
Properly treated water, clean surrounds and few people. A crowded pool on a hot Sunday is a different proposition from an empty one on a weekday morning.
Avoid
- Untreated lakes, tanks, rivers and the sea
- Shared changing-room floors barefoot
Never swim alone
Somebody who knows you are on treatment should be there and watching. Tiredness and dizziness arrive faster in water than most people expect.
Wear slippers around the pool and in the changing room
Wet shared floors are where foot infections are picked up, and cracked skin between the toes is common during treatment. Keep your feet covered until you are in the water.
Afterwards
- Shower and dry thoroughly, including between the toes
- Moisturise, since chlorine dries the skin badly
Keep it short and gentle
A quarter of an hour of easy movement rather than laps against the clock. Getting out while you still feel fine is the version that lets you go again next week.
Protect the skin afterwards
Chlorine is hard on skin that treatment has already dried out, and cracked skin then becomes the very risk you were avoiding. Rinse thoroughly and moisturise every time.
!
Get medical help the same day for any of these after a swim
A fever or shivering uncontrollably · redness, pain, swelling or discharge around a port, line or wound · a red spreading area of skin anywhere · diarrhoea or vomiting that will not settle · a painful red eye · breathlessness or chest pain · feeling faint. Go to the nearest emergency department and say clearly that the person is on chemotherapy. Do not give paracetamol to bring a temperature down before being seen.
Being straight with you
What this page cannot tell you
It cannot tell you whether you may swim. That depends on whether you have a port or line, how your counts are behaving, the state of your skin, whether you have had radiotherapy, and which pool you have in mind. Only your own team can answer it, and it takes one question.
It also cannot vouch for any particular pool. Water treatment and cleanliness vary enormously, and a pool that looks clear is not necessarily well maintained. If you are unsure about a pool, that is reason enough to leave it.
The exercise is replaceable; the infection is not worth it
If the answer is no, walking, gentle indoor cycling and physiotherapy exercises give you most of the same benefit without the risk. Nothing about swimming is so valuable that it is worth a line infection.
Children on treatment need the same rules, applied more firmly
A child with a port and low counts should not be in a pool, however much they want to be. Ask the treating team and give the child something else to look forward to instead.
Ask again after treatment ends
Once the port is out, the wounds have healed and the counts have recovered, swimming is usually available again and is an excellent way back into exercise. Ask at your end-of-treatment review.
What to do next
Ask your oncologist directly, mentioning your port or line, your recent counts, the state of your skin and the pool you have in mind. If the answer is yes, go at a quiet hour with somebody, keep it short, wear slippers on wet floors, and rinse and moisturise afterwards.
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Commonly believed
Four assumptions about swimming
"Chlorine kills everything, so a pool is safe."
Chlorinated water still carries organisms, and it also dries and cracks skin that treatment has already damaged. Cracked skin is itself an entry point for infection.
"The port is under the skin, so water cannot reach it."
The entry site and any dressing must stay dry and clean, and an infection reaching a central line is a serious event. Ask your team what applies to your device and for how long.
"Swimming is gentle, so it must be the safest exercise."
Gentle on the joints, yes. The concern here is infection rather than exertion, which is why swimming is one of the few activities frequently ruled out while walking is encouraged.
"A dip in the river or the sea is no different."
Untreated water carries a far wider range of organisms than a maintained pool, and it is generally best avoided for the whole course whatever your counts are doing.
Questions we are asked
Common questions about swimming on treatment
Can I swim with a port in place?
Usually not. The site and any dressing must stay dry and clean, and a line infection is a serious event. Ask your team what applies to your device and when it will come out.
Is a swimming pool safe when my counts are low?
No. Even a well-maintained pool carries organisms, and low white cells are the reason to be careful. If you swim at all, swim in the recovered week and ask which days those are.
What about the sea or a lake?
Best avoided for the whole course. Untreated water carries a much wider range of organisms than a chlorinated pool, and the risk is not worth the swim.
Does chlorine harm the skin during treatment?
It dries it, and treatment has already dried it. Cracked skin then becomes an entry point for infection. Rinse thoroughly, dry between the toes and moisturise every time.
My child is on chemotherapy and wants to swim.
Ask the treating team, and expect the answer to be no while a port is in place or counts are low. Offer something else to look forward to rather than making an exception.
Is water exercise for a stiff shoulder allowed?
Sometimes, once wounds have healed and if there is no line in place. Ask your physiotherapist and your oncologist together, since the benefit and the infection risk both need weighing.
What should I do if I develop a fever after swimming?
Go to the nearest emergency department the same day and say the person is on chemotherapy. Mention the swim and any port or wound. Do not give paracetamol to bring the temperature down first.
When can I swim again after treatment?
Usually once the port is out, wounds have fully healed and counts have recovered. Ask at your end-of-treatment review, because it is an excellent way back into exercise afterwards.
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Sources
- Cancer Research UK — Exercise and cancer treatment
- Macmillan Cancer Support — Physical activity and cancer
- American Cancer Society — Physical Activity and the Person with Cancer
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.
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