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Cancer and its treatments can affect both your body and your mind. Treatments like chemotherapy and radiation therapy work hard to fight the disease. But they can also cause side effects that change how you feel day to day.

Knowing what to expect can help you feel more prepared. It also helps you understand how side effects might impact your routine and what you can do to feel better.

What Are Common Cancer Treatment Side Effects?

Cancer treatment looks different for everyone. It depends on the type of cancer, where it is in the body, the stage of the disease, the medications being used, and your overall health.

That’s why side effects can vary so much. Before you begin treatment, talk with your doctor. Ask about the side effects you are most likely to experience with your specific plan.

Radiation

Radiation side effects can vary based on the part of the body undergoing treatment. Some general side effects include:

• Fatigue or tiredness.
• Hair loss in the area receiving radiation.
• Skin changes in the treatment area, such as redness, dryness, irritation, swelling, blistering, or a sunburned or tanned appearance.

Other side effects depend on the area of the body being treated:

• Abdomen — Nausea, vomiting, stomach cramps, diarrhea, or constipation.
• Breast — Breast tenderness, soreness, or swelling.
• Chest — Sore throat or problems with swallowing.
• Head or neck — Mouth or throat sores, dry mouth, trouble swallowing, changes in taste, nausea, earaches, gum or throat swelling, jaw stiffness, or hair loss on the head.
• Pelvis — Bladder issues, changes in fertility, or a decrease in sexual desire.

Chemotherapy

General chemo side effects include:

• Diarrhea or constipation.
• Fatigue.
• Hair loss.
• Mouth sores.
• Nausea and/or vomiting.
• Nerve changes, which can cause tingling, numbness, or the inability to feel anything in the area.
• Trouble concentrating, focusing, or remembering.
• Weakened immune system.

How Does Cancer Treatment Affect Daily Life?

Cancer treatment can affect how you feel and what you can do each day. Some days may be tough, especially right after treatment. Other days, you might feel more like yourself. These ups and downs are a normal part of the treatment process.

• Appearance — Chemotherapy and radiation can affect how you look. Hair loss, weight changes, and skin concerns are all common.
• Emotions — You may experience sadness, anxiety, or overwhelming emotions. These are normal reactions when going through cancer treatment. If these feelings persist or worsen, don’t hesitate to reach out. Your doctor, social worker, or therapist can help you cope.
• Fatigue and energy — Fatigue is one of the most common side effects. It isn’t just feeling tired, but a deep exhaustion that rest may not fix. You may need to scale back your usual activities, such as work, school, or chores. Permit yourself to rest when you need it.
• Finances — Cancer can disrupt work, routines, and income. You or your caregiver may need time off. Travel, childcare, and daily expenses can add stress. Talk to your care team or a social worker if financial issues are causing you worry. They can connect you with resources that may help.
• Nausea — Nausea is a common side effect of chemotherapy. It can also happen with radiation, especially when treating the stomach or brain. Your doctor can prescribe medicine to help.
• Needing help — You may need more help than usual with things, such as getting to appointments, preparing meals, or caring for children or loved ones.
• Pain — You may feel pain in the area of the cancer or elsewhere in your body. This can vary day to day. Talk to your care team about ways to manage it.
• Sexual health — Treatment can affect your sex drive and sexual function. This can be temporary or long-term. Discuss this change with your doctor.
• Thinking and focus — Some people notice “chemo brain,” where it’s harder to think clearly, focus, or remember things. You may forget things or feel mentally slower. This can be frustrating, but it usually improves over time.
• Work and school — Fatigue, pain, or risk of infection may keep you from your usual schedule. You may need time off, shorter hours, or special arrangements.

How Do I Manage Side Effects of Cancer Treatment?

Cancer treatment can bring many changes. Some days may feel hard, and others more normal. With support and small changes, you can feel more in control and comfortable during treatment.

• Ask for help — Don’t be afraid to ask for help. Lean on friends, family, or support groups for support. Many hospitals have counselors, social workers, or patient navigators who can provide emotional support and assistance with day-to-day needs.
• Be kind to yourself — Some days will feel harder than others, and that’s okay. Be gentle with yourself and take it one day at a time. You are doing the best you can.
• Get better sleep — Treatment and stress can make it hard to sleep. Try going to bed and waking up at the same time each day. Keep your room quiet and calm. Avoid screens and heavy meals before bed. Try reading, practicing deep breathing, or listening to soft music to wind down. If sleep is still a challenge, talk to your doctor.
• Know when to call — Call your doctor immediately if you have a fever, chest pain, trouble breathing, or bleeding that won’t stop. Don’t wait if you feel weak, dizzy, or sad. Ask your doctor about other symptoms that prompt you to call and alert the team.
• Prepare for harder days — Many people feel their worst one to three days after chemotherapy. Radiation side effects can build over time, often peaking in the final weeks of treatment and continuing for a short time after it ends. As you begin treatment, look for these trends and plan ahead. Try to keep your schedule lighter during those times. Ask for help, rest more, and stay hydrated.
• Take care of your body — Caring for your body is crucial during cancer treatment. Eat balanced meals, drink plenty of water, and get as much rest as you need. Light movement, like walking or stretching, can also help boost your energy and mood.
• Talk to your care team — Your care team is there to help, not just with treatment, but with everything that comes with it. If you are in pain, have a new symptom, or just don’t feel like yourself, speak up. They may be able to adjust your treatment or offer support to ease your symptoms.
• Track your side effects — Use a notebook or app to record your daily feelings and bring this information to your appointments. It will help your care team understand what’s happening and how they can help.