11 Things Not to Do During Chemotherapy: What to Avoid

Medical note: This article is for educational purposes only and does not replace advice from your oncologist, oncology nurse, pharmacist, dietitian, or care team. Chemotherapy plans vary widely, so the safest rule is simple: when in doubt, ask the people managing your treatment.

Chemotherapy is not exactly a casual spa appointment with a side of IV tubing. It is powerful cancer treatment designed to attack fast-growing cancer cells, and because the body also has healthy fast-growing cells, chemo can bring side effects like fatigue, nausea, mouth sores, lowered white blood cell counts, appetite changes, skin sensitivity, and a suspicious new relationship with crackers.

Knowing what to avoid during chemotherapy can help reduce infection risk, prevent medication interactions, protect your energy, and make treatment days a little less chaotic. The goal is not to live in a bubble wrapped in hand sanitizer and fear. The goal is to make smart, practical choices that support your body while your medical team does the heavy lifting.

Below are 11 things not to do during chemotherapy, with clear examples, realistic alternatives, and patient-friendly explanations.

1. Do Not Ignore Fever or Signs of Infection

During chemotherapy, your white blood cell count may drop, making it harder for your body to fight germs. This condition, often called neutropenia, can turn a small infection into a serious problem faster than anyone wants. A fever during chemotherapy should never be brushed off as “probably nothing.”

Call your cancer care team immediately if you have a temperature of 100.4°F or higher, chills, a new cough, sore throat, burning with urination, redness or swelling, diarrhea, vomiting, or any symptom your team told you to report. Do not take fever reducers just to “see if it goes away” unless your oncology team has specifically told you to do so. Medicine may lower the number on the thermometer while the real problem keeps throwing a tiny germ party in the background.

Better choice:

Keep your clinic’s after-hours number saved in your phone. Write down your treatment date, chemo drugs, and latest blood count information if you have it. When calling, say clearly: “I am receiving chemotherapy and I have a fever.” That sentence gets attention for a reason.

2. Do Not Skip Hand Hygiene and Basic Infection Precautions

Handwashing may sound boring, but during chemotherapy it becomes one of the most underrated superpowers. Germs can come from door handles, phones, grocery carts, shared food, pets, soil, and people who insist they are “not contagious anymore” while coughing like a haunted accordion.

Avoid close contact with people who are sick, crowded indoor spaces when your blood counts are low, and situations where you cannot control exposure. This does not mean you must disappear from society. It means you should choose low-risk ways to stay connected: short visits, outdoor meetups, masks in crowded places, and polite boundaries with anyone who has symptoms.

Better choice:

Wash hands before eating, after using the bathroom, after touching pets, after being in public, and before handling medication. Ask visitors to wash their hands too. If someone is offended by that, remember: your immune system gets the deciding vote.

3. Do Not Eat Raw, Undercooked, or High-Risk Foods Without Approval

Food safety during chemotherapy matters because treatment can weaken the immune system. Raw or undercooked foods may contain bacteria, viruses, or parasites that a healthy immune system might handle more easily, but a chemo-weary immune system may not appreciate.

Common foods to avoid during chemotherapy may include raw sushi, raw oysters, undercooked eggs, rare meat, unpasteurized milk or juice, unwashed produce, deli foods from questionable counters, buffet foods, salad bars, and anything that has been sitting out long enough to develop its own personality.

Some patients are allowed to eat carefully washed raw fruits and vegetables; others, especially those with very low white blood cell counts or intensive treatment plans, may receive stricter instructions. This is why personalized guidance matters.

Better choice:

Choose fully cooked meats, pasteurized dairy, freshly prepared meals, washed and peeled produce when recommended, and leftovers stored promptly in the refrigerator. Use separate cutting boards for raw meat and ready-to-eat foods. A food thermometer is more reliable than the classic “squint at the chicken and hope” method.

4. Do Not Start Supplements, Herbs, CBD, or Probiotics Without Asking

Natural does not always mean safe during cancer treatment. Grapefruit, St. John’s wort, high-dose antioxidants, herbal teas, turmeric pills, CBD products, melatonin, probiotics, and vitamin megadoses can interact with chemotherapy drugs, affect bleeding risk, change how the liver processes medicine, or interfere with treatment timing.

This does not mean every supplement is forbidden. Some people need vitamin D, iron, protein drinks, pancreatic enzymes, electrolyte support, or other nutrition help. The issue is taking products without telling the team. Your oncologist and pharmacist need the full list, including “just a gummy,” “only a tea,” and “my aunt swears this fixed her neighbor’s cousin.”

Better choice:

Bring every bottle, powder, tea, tincture, and over-the-counter medicine to your appointment or make a photo list. Ask: “Is this safe with my chemo drugs?” That question can prevent a lot of trouble.

5. Do Not Drink Alcohol Without Medical Clearance

Alcohol can worsen nausea, dehydration, mouth irritation, liver stress, sleep problems, and medication side effects. Many chemotherapy drugs and supportive medicines are processed by the liver, so adding alcohol may make treatment harder on the body. For some cancer types and treatment plans, avoiding alcohol completely is the safest option.

Even small amounts may be a bad idea if you have low platelets, liver involvement, mouth sores, poor appetite, vomiting, diarrhea, or medications that interact with alcohol. In short, chemo already gives the liver enough paperwork.

Better choice:

Ask your oncology team directly whether alcohol is allowed with your treatment plan. If you miss the ritual of a special drink, try sparkling water with citrus, ginger tea, fruit-infused water, or a mocktail that looks fancy enough to deserve a tiny umbrella.

6. Do Not Miss Medications or Change Doses on Your Own

Supportive medicines are part of chemotherapy care, not optional decorations. Anti-nausea drugs, steroids, mouth rinses, bowel medications, antibiotics, antiviral medicines, growth factor shots, and pain medicines may be prescribed for very specific reasons.

Skipping anti-nausea medication because you “feel fine right now” can backfire later. Stopping steroids suddenly may cause problems. Taking extra pain relievers may increase bleeding risk or affect the liver or kidneys. Even common drugs like ibuprofen, aspirin, or acetaminophen may need special approval depending on your blood counts and symptoms.

Better choice:

Use a written schedule, phone reminders, or a pill organizer if your team approves. Call before changing doses. If side effects from a medication are bothering you, say so; the team may be able to adjust the plan.

7. Do Not Ignore Mouth Care or Eat Foods That Make Mouth Sores Worse

Chemotherapy can irritate the mouth and throat, causing dryness, tenderness, taste changes, or mouth sores. Once mouth sores appear, spicy chips and acidic orange juice become less like snacks and more like tiny firecrackers.

Avoid hard, sharp, spicy, acidic, or very hot foods if your mouth is sore. That may include tortilla chips, crusty bread, citrus, tomato sauce, hot peppers, alcohol-based mouthwash, and rough-textured foods. Also avoid dental work during chemotherapy unless your oncologist and dentist agree it is safe.

Better choice:

Use a soft toothbrush, gentle rinses recommended by your care team, and bland, soft foods such as oatmeal, smoothies, scrambled eggs, mashed potatoes, soups, yogurt, custards, or well-cooked pasta. If eating hurts, report it early. Mouth pain can affect nutrition, hydration, and infection risk.

8. Do Not Push Through Extreme Fatigue Like It Is a Fitness Challenge

Fatigue is one of the most common chemotherapy side effects. This is not regular “I stayed up too late” tiredness. It can feel like your battery is at 4%, the charger is missing, and someone opened 37 apps in the background.

Do not force intense workouts, overloaded workdays, or major commitments when your body is clearly asking for recovery. Overdoing it may worsen exhaustion, increase fall risk, and make it harder to eat, hydrate, and attend appointments.

Better choice:

Try gentle movement if your team says it is safe: short walks, stretching, light household activity, or beginner-level yoga. Balance activity with rest. Plan demanding tasks for the time in your chemo cycle when you usually feel best. Accept help with errands, meals, childcare, rides, or chores. Help is not weakness; it is strategy.

9. Do Not Get Vaccines, Dental Procedures, or Invasive Treatments Without Checking First

Vaccines can be important for people with cancer, but timing matters. Some vaccines are not live and may be recommended, while live vaccines are generally avoided during periods of significant immune suppression. Dental procedures, surgeries, tattoos, piercings, injections, and cosmetic treatments may also raise infection or bleeding concerns during chemotherapy.

Do not schedule procedures assuming they are automatically safe. Blood counts, platelet levels, immune status, medications, and treatment timing all matter.

Better choice:

Before vaccines or procedures, ask your oncology team: “Is this safe right now, and is this the best timing?” That one question can prevent delays, complications, and frantic phone calls from waiting rooms.

10. Do Not Have Unprotected Sex or Try to Become Pregnant During Treatment

Chemotherapy can affect eggs, sperm, fertility, pregnancy, and fetal development. Many cancer teams recommend effective birth control during treatment and for a period afterward. Chemo drugs may also be present in body fluids for a short time after treatment, so your team may recommend condoms or other precautions.

Do not assume infertility during chemotherapy means pregnancy is impossible. Also do not assume sexual activity is unsafe for everyone. The right answer depends on your treatment, blood counts, symptoms, partner, and fertility goals.

Better choice:

Ask your oncologist about contraception, fertility preservation, sexual activity, body fluid precautions, and how long precautions should continue after each treatment. These conversations can feel awkward for about 11 seconds, but they are important and completely normal in cancer care.

11. Do Not Handle Chemotherapy Medication or Body Fluids Carelessly at Home

If you take oral chemotherapy at home, safety instructions matter. Chemotherapy medicine should usually be stored away from children, pets, food, heat, moisture, and sunlight. It should not be crushed, split, or opened unless your care team specifically says it is safe. Caregivers may need gloves when handling pills, vomit, urine, stool, or contaminated laundry.

Many chemo medicines can leave the body through fluids for a limited time after treatment. Your clinic may give instructions about flushing toilets, washing laundry, cleaning spills, and protecting caregivers. Follow those instructions exactly, even if they seem overly detailed. Chemo safety is one area where “close enough” is not the vibe.

Better choice:

Keep a printed copy of home safety instructions. Use a dedicated medication area away from food prep. If a pill is dropped, vomit spills, or a dose is missed, call the clinic or pharmacist for the correct next step.

Common Questions About What to Avoid During Chemotherapy

Can I go out in public during chemotherapy?

Often, yes, but use judgment. Avoid crowded indoor places when your white blood cell count is low or when respiratory infections are spreading. Consider masks, outdoor activities, off-peak shopping times, and distance from anyone who is sick.

Can I eat restaurant food while on chemo?

Many patients can, but choose carefully. Avoid buffets, salad bars, undercooked foods, and restaurants with questionable cleanliness. Ask for food to be cooked thoroughly and served hot. If your care team gives stricter food rules, follow those instead.

Can I exercise during chemotherapy?

Gentle activity may help some people manage fatigue, mood, and strength, but exercise should match your energy level and medical situation. Avoid intense workouts if you are dizzy, severely anemic, dehydrated, feverish, in pain, or at risk of falls.

Can I be around pets?

Usually, yes, but avoid bites, scratches, litter box cleaning, animal waste, reptiles, sick animals, and raw pet food. Wash hands after touching pets. Ask for help with litter boxes, cages, or aquarium cleaning if your immune system is low.

Practical Experiences and Lessons From Chemotherapy Life

People going through chemotherapy often learn that the hardest part is not just the infusion day. It is the rhythm afterward: the day you feel surprisingly okay, the day your appetite disappears, the day water tastes like loose change, and the day your energy returns just enough for you to consider reorganizing the garage before immediately regretting that thought.

One common experience is that side effects can follow a pattern. For example, a person may feel decent on treatment day because of steroid medicines, tired two days later, nauseated around day three, and more normal by the second week. Tracking symptoms in a notebook or phone app can help patients plan meals, rest, work, childcare, and social activities around their personal cycle. The pattern is not perfect, but it is better than guessing every morning like chemotherapy weather forecasting.

Another practical lesson is that food rules can feel emotional. People may be told to avoid sushi, runny eggs, deli sandwiches, buffets, or fresh salad bars, and suddenly the forbidden food becomes the only thing that sounds appealing. The trick is not to aim for a perfect wellness magazine diet. The goal is safe, adequate nutrition. If a patient can tolerate scrambled eggs, soup, toast, rice, bananas, smoothies made with pasteurized ingredients, baked potatoes, oatmeal, or well-cooked chicken, that counts as progress. During chemo, “fed and hydrated” is sometimes the trophy.

Many patients also discover that asking for help early prevents bigger problems later. Waiting until dehydration is severe, mouth sores are unbearable, or constipation has become a full household emergency is rarely worth it. Oncology nurses hear these issues every day. They are not shocked by bowel questions, taste complaints, skin rashes, or the fact that someone cried because a favorite food suddenly tasted like a car battery. Reporting symptoms early can lead to medication changes, nutrition advice, hydration support, or simple fixes that make the next cycle easier.

Caregivers learn lessons too. The best help is often specific: driving to appointments, preparing safe meals, cleaning high-touch surfaces, walking the dog, picking up prescriptions, or sitting quietly without delivering a TED Talk about positivity. Patients do not always need motivational speeches. Sometimes they need ginger tea, clean sheets, a ride, and someone who will not take it personally when they cancel plans.

Emotionally, chemotherapy can make people feel both strong and fragile at the same time. Avoiding certain foods, crowds, alcohol, supplements, and risky activities may feel limiting, but these choices are temporary tools, not punishments. Each precaution is a way of giving treatment the best possible chance to work while reducing preventable complications. Think of it as building a safety fence around your body while it handles a very demanding construction project.

The most useful mindset is flexible caution. Be careful, but do not panic. Ask questions, but do not drown in internet rabbit holes. Follow your care team’s instructions, but speak up when something is confusing or unrealistic. Chemotherapy is hard enough without pretending you must do everything perfectly. Safer choices, honest communication, and small daily adjustments can make the experience more manageable.

Conclusion: What to Avoid During Chemotherapy Comes Down to Safety, Timing, and Communication

The most important things not to do during chemotherapy are the ones that increase infection risk, interfere with medication, worsen side effects, or delay urgent care. Avoid ignoring fever, eating high-risk foods, taking unapproved supplements, drinking alcohol without clearance, skipping prescribed medicines, overexerting yourself, and scheduling vaccines or procedures without checking first.

At the same time, chemotherapy precautions should be personalized. Your diagnosis, chemo drugs, blood counts, other medications, age, nutrition status, and treatment goals all matter. Keep your oncology team informed, report symptoms early, and ask before making changes. You do not need to be perfect; you need to be prepared, honest, and careful in the ways that count.