What Symptoms Should I Call My Oncology Team About Today?

This page is for people in cancer treatment and their caregivers. It sorts symptoms into three groups: go to the ER, call your team now, or note it for your next visit.

Cancer treatment brings new physical sensations, side effects, and questions. Many changes are expected. Some need a same-day call. A few need emergency care right away. Medical guidance sorts symptoms into three groups.

Call 911 or go to the emergency room now

Go straight to emergency care for any of these acute, life-threatening signs. Do not drive yourself.

• Severe shortness of breath: sudden difficulty breathing, gasping for air, or chest tightness.
• Chest pain or pressure, especially spreading to the arm, neck, jaw, or back, or with sweating and dizziness.
• Heavy bleeding: coughing up blood, vomiting blood or coffee-ground material, bright red blood in bowel movements, or uncontrolled bleeding from a cut or line site.
• Sudden neurological changes: weakness or numbness on one side of the face or body, slurred speech, sudden vision loss, or severe new confusion.
• Severe allergic reaction: swelling of the lips, tongue, or throat, hives, or sudden trouble swallowing during or after a medication.

Call your oncology team's 24/7 line now

Call your clinic or on-call provider immediately, day or night, for any of these signs.

• Fever. A temperature of 100.4°F (38°C) or higher, or lower if that is the number your team gave you. Sources word the exact figure slightly differently (see the table below), so use the number your own team gave you. Talk with your team before taking any medicine for a fever, even acetaminophen (Tylenol). NCI says it can hide signs of a more serious problem.
• Shaking chills or rigors. Uncontrolled shivering or feeling freezing cold, even without a measured fever.

CDC lists vomiting, diarrhea, new pain, burning or pain when passing urine, and redness or swelling at a wound or port as signs of infection to call about right away. If your treatment plan gives you specific figures, use those.

• Nausea or vomiting. Being unable to keep liquids down, or vomiting despite taking prescribed anti-nausea medicine.
• Diarrhea. New or worse diarrhea, or diarrhea that causes dizziness.
• Signs of local infection. Increasing redness, warmth, swelling, pain, or pus around a surgical wound, PICC line, or port site.
• New or uncontrolled pain. Pain that is new, rapidly worsening, or not relieved by your prescribed pain medication.
• Trouble urinating. Painful urination, dark or cloudy urine, or passing little or no urine.

Log it and mention it at your next visit

These non-urgent symptoms can wait for a routine appointment.

• Mild, predictable fatigue that improves with rest.
• Mild taste changes or a metallic taste in the mouth.
• Gradual, expected hair thinning or hair loss.
• Mild skin dryness or minor fingernail changes.
• Mild constipation that responds to your team's recommended bowel plan.

Primary safety rule: Always follow the personalized call plan and emergency thresholds from your oncologist, care team, or discharge paperwork. Your team's specific instructions always come before general guidance like this page.

Different trusted sources word the fever threshold slightly differently. They are all describing about the same temperature, close to 38°C.

38.0°C converts to 100.4°F, which makes 100.4°F the lowest of these figures and the one to act on if nobody has given you another. NCI's 100.5°F sits a fraction above it. None of these sources is wrong, but do not read the gap between them as permission to wait.

For someone on chemotherapy, one reading of 100.4°F (38°C) or higher is enough: call your care team right away, at any hour, and do not wait an hour or check again first. CDC says to call your doctor immediately at that number (CDC). If your team has given you a lower number, use theirs.

The American Cancer Society adds the advice that matters most. "Ask your cancer care team what temperature they consider to be a fever. It might be different depending on your situation, but 100.4°F (38°C) is often used." Ask in advance, and follow your own team's number. If your reading falls between these figures and you are unsure, call.

David, a 58-year-old high school principal in his second round of chemotherapy for colon cancer, woke up on a Saturday feeling unusually tired and flushed. His temperature read 100.6°F (38.1°C). "It's Saturday, it's not even 101°F, and I don't want to disturb the doctor on a weekend for a mild fever," he thought.

His daughter checked his clinic binder instead. It said: "Call our 24/7 line immediately for any fever of 100.4°F (38°C) or higher." She called. Within ten minutes, the on-call oncology fellow told David to go straight to the emergency department for blood cultures and IV antibiotics.

Tests showed David's white blood cell count was low and he had an early bacterial infection. Prompt IV antibiotics controlled it within 24 hours and prevented severe sepsis. David later said: "I thought I was being polite by waiting. Learning that calling after hours is an expected part of cancer care gave me peace of mind for the rest of my treatment."

This is a representative story built from common experiences described by patients and caregivers. It is not one identifiable person, and individual experiences can differ.

Use this simple log to track side effects, so you can share clear, objective information whenever you call your clinic.

1. What temperature reading should prompt an immediate call to your clinic?
2. What is the exact phone number for after-hours, weekend, or holiday concerns?
3. Which anti-nausea, anti-diarrheal, or fever medications should I keep at home?
4. Are there symptoms specific to my treatment that I should watch for?
5. If I need the emergency room, which hospital does your oncology group cover?

• Fever is an emergency during chemo. Never ignore a temperature of 100.4°F (38°C) or higher during active treatment, and use a lower number if that is what your team gave you.
• Always call when in doubt.
• Keep your clinic numbers handy. Store your daytime and 24/7 after-hours numbers on your phone and refrigerator.
• Emergency signs require 911. Severe chest pain, sudden shortness of breath, heavy bleeding, or stroke signs need immediate emergency care.

These are common questions about when to call.

What fever reading means I must call my oncology team immediately?

Act at 100.4°F (38°C) or higher, and call right away, at any hour. One reading is enough. If your team has given you a lower number, use theirs, and call if you are unsure.

Can I take Tylenol or ibuprofen to bring down a fever during chemotherapy?

Not before you talk with your oncology team. NCI says to talk with your doctor or nurse before taking any medicine for a fever, even aspirin, acetaminophen (Tylenol) or ibuprofen (Advil). These medicines can hide signs of a more serious problem.

What should I tell the emergency room staff when I arrive?

Tell the triage staff right away: "I am currently receiving cancer treatment with [chemotherapy/immunotherapy], and my oncologist instructed me to be evaluated for [fever/symptom]."

• Cancer Caregiver Emergency Checklist
• When is a Side Effect an Emergency?
• How to Track Cancer Symptoms and Side Effects
• What to Expect at Your First Chemotherapy Infusion

• National Cancer Institute (NCI): Infection and Neutropenia during Cancer Treatment — source of the guidance to check with your doctor or nurse before taking medicine for a fever, because it can mask signs of a more serious problem. https://www.cancer.gov/about-cancer/treatment/side-effects/infection.
• National Cancer Institute (NCI): Side Effects of Cancer Treatment. https://www.cancer.gov/about-cancer/treatment/side-effects.
• American Cancer Society: Fevers — source of the advice to ask your team what number they use. https://www.cancer.org/cancer/managing-cancer/side-effects/infections/fever.html.
• Centers for Disease Control and Prevention (CDC): Watch Out for Fever — source of the 100.4°F (38°C) figure. https://www.cdc.gov/cancer-preventing-infections/patients/fever.html.
• Centers for Disease Control and Prevention (CDC): Signs and Symptoms of Infection. https://www.cdc.gov/cancer-preventing-infections/patients/symptoms.html.
• Centers for Disease Control and Prevention (CDC): Preventing Infections in Cancer Patients. https://www.cdc.gov/cancer/preventinfections.