Looking After Your Port — Between Cycles
Your port needs attention even on the weeks you are not having treatment. A port left unused can block — and a blocked port delays your next cycle. This page explains what your care team does to keep it working, and what you watch for at home.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- Flushing is not optional — A port left without regular flushing can develop a clot inside the catheter, making it unusable when treatment is due.
- Done at a clinic, not at home — Flushing requires a trained nurse, a sterile Huber needle, and the correct solutions. It cannot be done safely at home.
- Your job is to watch the site — Between visits, check the skin over the port daily for redness, swelling, warmth, or discharge.
- Infection needs same-day contact — The catheter sits close to a major vein. Any sign of infection around the port means calling your team today, not waiting.
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Yes, your port needs flushing at regular intervals between treatment cycles. A port left unused can block, delaying treatment. Flushing is done by a trained nurse at a clinic — not at home. Your care team will give you a specific schedule based on your port type and the gap between your cycles.
Why does a port need flushing when it is not being used?
A port is a small chamber under your skin, connected to a catheter that runs into a large vein near your heart. When nothing is flowing through it, blood can creep into the catheter tip and clot.
Flushing prevents this. A nurse inserts a Huber needle through the skin into the port, clears the line with saline, and then leaves a small amount of heparin solution inside. The heparin sits in the line and prevents clotting until your next visit.
It is a short clinic visit, not a treatment session. Your care team will let you know in advance when you need to come in.
What you can do at home between clinic visits
- Check the skin over your port site every day — look for redness, swelling, warmth, or discharge.
- Keep the area clean and dry. Avoid scrubbing directly over the port.
- Do not let anyone other than your trained care team insert a needle into your port.
- Avoid heavy bags or tight straps on the same side as your port.
- Carry your port card to every appointment, including any unplanned or emergency visit.
- Call your team the same day if the site looks or feels different from your usual.
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Words your team may use
- Huber needle
- A special curved needle designed to pass through the port's rubber septum without damaging it. Only Huber needles are used to access an implanted port — a standard injection needle is not suitable.
- Saline flush
- Sterile salt water pushed through the port to clear it before and after any use, or as part of routine maintenance between cycles.
- Heparin lock
- A small amount of heparin solution left inside the catheter after flushing. It prevents clotting in the line until the next access.
- Septum
- The firm rubber seal on the top of the port chamber. The Huber needle passes through this seal when the port is accessed, and it reseals after the needle is removed.
- De-access
- Removing the needle from the port after a flush or infusion. Once de-accessed, the port is sealed under the skin again with no external parts.
How often does your port need to be flushed?
The interval between maintenance flushes varies by port type and by your centre's protocol. Your care team will give you a specific schedule — follow that rather than any general guidance you read elsewhere.
If the gap between your cycles is short, a flush may happen at the start of each cycle as part of that visit. If you have a longer break — such as after completing a course of chemotherapy and before your review — your team will book a separate flush appointment.
If you are ever unsure whether a flush is overdue, call and ask. It is a short visit, and maintaining the port now protects the access you will need when treatment resumes.
Signs of infection around your port — call the same day
A port infection is serious because the catheter sits directly inside a large vein. Do not wait for your next appointment if you notice redness or warmth spreading around the port site, swelling that was not there before, any discharge from the skin, or a fever.
A port that suddenly feels painful during access, or where the nurse notices the flush does not flow smoothly, also needs to be taken seriously. Do not push through resistance — tell your nurse immediately so they can assess before continuing.
You do not need to be certain it is infected before calling. Calling when you are unsure is the right call. Your team will tell you whether to come in to the clinic or go directly to the emergency department.
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Frequently asked questions
Can I flush my own port at home?
No. Flushing a port requires a Huber needle, sterile saline, heparin solution, and trained technique to avoid introducing infection directly into your bloodstream. These cannot be done safely outside a clinical setting. If travelling to a clinic is genuinely difficult for you, ask your team whether a home-nursing service can visit you to perform the flush. That option is available in some areas.
What happens if I miss a flush appointment?
A missed flush increases the risk of the catheter clotting. A clotted port may be unusable, which can delay your next treatment while the team assesses it. If you cannot attend a scheduled flush, call ahead and rebook rather than simply not going. Your team can usually find an alternative slot quickly, and reaching them before the port blocks is much simpler than managing a block after it has happened.
How do I know if my port has blocked?
You will not usually be able to tell at home, because you cannot access the port yourself. The nurse will notice during the next access — the flush may not go in smoothly, or blood cannot be drawn back easily. At home, what you watch for is any change around the site: pain, new swelling, or redness. Those are your signals, not a sensation of blockage. Always report anything unusual at the site to your care team.
Can I shower or bathe normally with a port?
Yes, when the port is not accessed — that is, when there is no needle in place. Normal showering is fine. Ask your care team specifically about swimming or submerging the site, as their advice may vary depending on your port type and the condition of your skin. When a needle is in place during or just after a treatment visit, the dressing must stay dry and intact, and you should avoid activities that could dislodge it.
Does being accessed with a Huber needle hurt?
Most people feel a sharp sting for a moment when the needle goes through the skin, similar in sensation to a blood test. It typically eases immediately once the needle is in place. After the first few accesses, most people find it very manageable. If you are anxious about it, ask your nurse whether a numbing cream applied to the skin beforehand is suitable for you — your team can advise on how far in advance to apply it.
My port site looks red — should I go to emergency or call my team first?
Call your team first, unless you also have a fever or feel generally unwell, in which case go to the emergency department directly without waiting. When you call, describe what you see — how large the redness is, whether there is any swelling or discharge, and how long it has been there. Your team will tell you whether to come in to clinic or go to emergency. Do not wait to see whether it settles — port infections can escalate quickly because of where the catheter sits.
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