Medical Oncologist
CION Cancer Clinics
Red flags caregivers should watch for at home | CION Cancer Clinics
Most changes you see at home after colon cancer surgery or during chemotherapy are expected and settle with time. A short list cannot wait: a fever during chemotherapy, belly pain that keeps getting worse, a stoma that stops working with vomiting, or someone who cannot keep fluids down. This page sorts what needs a hospital today, what needs a call to the team, and what can wait for the next clinic visit. At CION Cancer Clinics, our team supports patients and families with diet, bowel changes and life during and after treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- What should you watch for at home with colon cancer?
- Which warning signs matter after surgery, on chemotherapy or with a stoma?
- What should you do in the first hour?
- Four things families tell themselves, and what is actually true
- What this page cannot tell you
- Common questions from caregivers about warning signs
The short answer
What should you watch for at home with colon cancer?
Watch for four things above everything else: fever, belly pain that is getting worse, a bowel or stoma that stops working, and fluids that will not stay down. Each can mean an infection, a leak or a blockage, and each is far easier to treat on the first day than the third. Most other changes, such as tiredness, a poor appetite or loose motions that settle, are expected and can wait for the next visit.
Why the caregiver often notices first
The person who is unwell often plays things down. They do not want to trouble the family, they are embarrassed to talk about their bowels, or they are too tired to judge. You see the plate left untouched, the third trip to the toilet before dawn, the stoma bag that has stayed flat since morning. That view is valuable. Trust it.
Expected or worrying?
The useful question is not whether something is unpleasant. It is whether it is new, and whether it is getting worse. Soreness around a healing wound that eases a little each day is expected. Pain that was settling and is now climbing again is not. Write down what you see, with the time, so you can describe it clearly when you call.
If the team gave you a written list of warning signs, that list comes first. This page fills the gaps around it.
!
Go to an emergency department today
Do not wait for the morning if the person is on chemotherapy and has a temperature of thirty-eight degrees or more, or is shivering. The same applies to severe or rising belly pain, vomiting with a swollen belly, a stoma that has stopped working with cramps, black or bloody vomit, fainting, breathlessness or new confusion. Say they have colon cancer and which treatment they are on. Check the temperature before giving paracetamol, because it can hide a fever.
Not sure whether this applies to you?
Ask an oncologistIt depends on the stage
Which warning signs matter after surgery, on chemotherapy or with a stoma?
The red flags change with where the person is in treatment. Read the card that fits them now.
In the first weeks after surgery
A leak where the two ends of bowel were joined is uncommon but serious. It usually shows as pain that worsens instead of easing, with fever and a fast pulse. The signs of a leak are explained in full by the surgical team's page.
- Pain climbing after a few better days
- Fever, shivering or a racing heart
- A wound that is hot, spreading red, opening or leaking pus
During chemotherapy
Chemotherapy lowers the white cells that fight infection, so a fever is treated as an emergency until a doctor says otherwise. Diarrhoea that does not settle with the medicine provided can dry the body out within a day. Read when diarrhoea becomes an emergency.
- Fever or shivering at any hour
- Diarrhoea at night, or far more often than usual
- Mouth sores so painful they stop drinking
- Red, peeling palms or soles that make walking hard
With a stoma
A healthy stoma is moist and pink or red. One that turns dark purple or black, or that stops working with cramps and vomiting, needs a doctor the same day. A busy ileostomy, the kind made from the small bowel, can dry someone out quickly. See stoma problems and when to call.
- Thirst, and dizziness on standing
- Dark, scanty urine
- Watery output filling the bag again and again
At any stage, including advanced disease
New yellowing of the eyes or skin, a belly that keeps swelling, vomiting everything, a painful swollen calf, or breathlessness at rest. These can mean the disease has changed or a clot has formed. The team needs to know that day, not at the next routine visit.
When you see one
What should you do in the first hour?
Check and write it down
Note the temperature, how many loose motions there have been or how often the bag was emptied, when they last passed urine and what they kept down. Times matter more than impressions.
Call the treating team
Use the number on the discharge sheet or chemotherapy card. Give the patient's name, say they have colon cancer, and give the date of the last chemotherapy or operation.
Decide where to go
If the team says come in, go. If you cannot get through and anything from the red box above is present, go to the nearest emergency department. Do not sit waiting for a call back about a fever on chemotherapy.
Take the papers with you
Carry the discharge summary, the latest blood report, the names of the chemotherapy drugs, the current medicine strips and a spare stoma bag. Emergency doctors decide faster with these in hand.
Commonly believed at home
Four things families tell themselves, and what is actually true
"We should not disturb the doctor at night."
Cancer teams expect night calls about fever and severe symptoms. A call that turns out to be nothing costs a few minutes. A fever left until morning during chemotherapy can become a serious infection.
"Give a paracetamol and see if the fever goes."
During chemotherapy the fever is the warning. Bringing it down at home can delay the antibiotics that matter. Measure it first, then call, and give paracetamol only if the team says so.
"The food did not suit him. Curd rice will settle it."
Curd rice is a sensible choice for mild loose motions. Diarrhoea from chemotherapy or a busy ileostomy can drain fluid faster than any diet replaces it. If it is not settling with the medicine provided, call the team.
"Not eating is just part of cancer."
A poor appetite is common during treatment and is not an emergency on its own. Not drinking is different. Vomiting everything, or passing very little urine, needs attention the same day.
Leave a number, we will call you
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Being straight with you
What this page cannot tell you
It cannot tell you whether a particular change is serious in the person you are caring for. That depends on their operation, their drugs, their blood counts and how they were last week, and only the treating team holds all of that. When in doubt, call. Nobody on a cancer team minds a careful family.
It cannot replace the plan you were given
Every discharge sheet and chemotherapy card carries its own thresholds and phone numbers. Where they differ from this page, follow them. If you were never given one, ask at the next visit for a written list of warning signs and the number to call after hours.
Who this does not apply to
This page is for adults at home after colon cancer surgery or during colon cancer treatment. It is not for children, or for someone still in hospital. Rectal cancer after pelvic radiation brings its own bladder and bowel concerns, covered on the rectal cancer pages. If care has moved to comfort first, some of these signs are expected, and the palliative care team will tell you which still need action.
If you are unsure which group a symptom falls into, call the helpline and describe it. Someone will tell you whether it needs a hospital tonight.Questions we are asked
Common questions from caregivers about warning signs
Is a fever always an emergency during chemotherapy?
Treat it as one. Chemotherapy can lower the white cells that fight infection, and an infection can move quickly when they are low. A temperature of thirty-eight degrees or more, or shivering, means calling the team and usually going to an emergency department the same day, even at night.
How do I know if a stoma problem is urgent?
A stoma that turns dark purple or black, bleeds steadily from inside, or stops working with cramps, a swollen belly or vomiting needs a doctor that day. Sore skin, small leaks and a bag that will not sit well are real problems, but they can usually wait for the stoma nurse.
How much diarrhoea is too much?
Use the limit the chemotherapy team gave you. As a rough guide, diarrhoea that wakes them at night, keeps going despite the medicine provided, or comes with dizziness, thirst and little urine needs a call today. Blood in the diarrhoea, or a fever with it, needs a doctor sooner.
What does a leak after bowel surgery look like?
Usually the person was improving and then turns worse. Belly pain climbs, a fever appears, the pulse races and they feel far more unwell than the day before. It is uncommon and tends to show in the early days at home, but it needs the surgical team the same day.
Should I call the doctor or go straight to hospital?
If anything from the red box is present, go to the nearest emergency department and call the team on the way. For other worrying changes, call first. The team may ask you to come in, arrange a blood test, or give you a clear plan for the night.
Can I give home remedies while we wait?
Fluids, rest and plain food are fine. Avoid herbal powders, kashayams or new tablets without asking, because some interact with chemotherapy or upset a healing bowel. Never stop or double a prescribed medicine on your own, and ask the team before trying anything new.
What if they refuse to go to hospital?
Embarrassment, fear and worry about money all play a part. Tell them plainly what you are seeing and why it worries you. Call the team on speakerphone so they hear it from a doctor. If they are confused, collapsing or cannot keep fluids down, call an ambulance.
Who can I call outside clinic hours?
The team that gave the last treatment is the first call, and their number should be on the discharge sheet or chemotherapy card. CION has one helpline for every centre, and it can tell you where to go. In a real emergency, go to the nearest hospital first.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- National Cancer Institute — Caregivers of Cancer Patients
- National Cancer Institute — Chemotherapy to Treat Cancer
- MedlinePlus — Ostomy
- NHS — Treatment for bowel 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.
Keep reading
Related pages
Caring for someone after colon cancer surgery at homeThe day-to-day routine around these warning signsStoma problems and when to callEvery stoma change, sorted by how urgent it isWhen bowel symptoms are an emergencyBlockage and bleeding signs in more detailLooking after yourself as a caregiverWatching for warning signs is tiring; this is about you
Talk to us
Not sure whether what you are seeing needs a hospital?
Tell us what you are seeing and when it started. We will tell you honestly whether it needs the emergency department, a visit or a careful watch tonight. One helpline serves every CION centre.