Why Cancer Can Make You Feel Like a Different Person
Dr. Alex P. Michael
What Your Brain Is Doing & Four Practical Ways to Feel More Like Yourself
by Alex P. Michael, MD, FACS
Before cancer, you may have been the person everyone counted on. You managed a household, made difficult decisions, and planned months ahead. Now you may struggle to choose dinner, look forward to a favorite activity, or return a friend’s call. Even when treatment is going well, you might wonder: What happened to me?
When I speak with survivors at our local Cancer Support Community, the conversation usually begins with treatments and side effects. It almost always turns to something harder to name. A cancer diagnosis changes more than your schedule. It can change how your brain anticipates rewards, responds to uncertainty, and seeks safety. These responses do not mean you are weak or failing to cope. They are understandable reactions to a life that suddenly feels less predictable.
1. When Nothing Sounds Exciting, Start Small
One of the most unsettling changes is losing the desire to do things you once loved. You may not feel excited about a vacation, a family gathering, or even tomorrow’s lunch. Yet once you arrive, you may still enjoy yourself.
There is a difference between looking forward to pleasure and feeling pleasure in the moment. Scientists call these “wanting” and “liking,” and the brain handles them through partly separate systems. The brain’s reward system, which involves the chemical messenger dopamine, is central to wanting: it helps us anticipate what may be worthwhile.
Research shows that this system learns from the difference between what we expect and what actually happens. When cancer makes the future uncertain, it may become harder to anticipate rewarding experiences. That flat, gray feeling is not a character flaw. It is, in part, your brain’s prediction system struggling with a future it can no longer picture clearly.
Try this: Make your next goal small enough to picture clearly. Walk to the mailbox. Sit outside for ten minutes. Call someone you enjoy. Choose one activity for today rather than trying to plan the next six months. You do not have to feel motivated before you begin. Sometimes enjoyment follows action.
2. When Everything Feels Out of Your Hands, Make One Choice
Cancer can take away choices you once took for granted. Tests, appointments, and treatment plans may begin to organize your life. It is understandable to feel as though decisions no longer belong to you.
Studies of stress and perceived control suggest that having meaningful choices helps people respond to difficult circumstances. Neuroscience research suggests that when the prefrontal cortex – the brain’s planning center, just behind the forehead – detects that we have some control, it can help quiet the body’s stress response. You cannot control every scan result. You can still influence parts of your day.
Try this: Before your next appointment, write down two questions you want answered. Ask whether there is flexibility in scheduling. Choose who accompanies you. Decide what you would like to do after treatment, even if it is simply resting at home with a favorite movie. Small decisions remind you that cancer is part of your life, not the author of every page.
3. When Your Mind Won’t Stop Asking “What If?”, Ask “What Now?”
Waiting for results can be exhausting. You may replay possibilities, search for symptoms online, or interpret every unfamiliar sensation as a warning. The brain’s alarm system, which includes a small structure called the amygdala, is designed to pay attention to uncertain threats. Unlike a problem with a clear answer, uncertainty can keep that internal alarm switched on.
You do not have to be cheerful to be resilient. You can be frightened and still take the next step. You can feel uncertain and still make a choice. You can need help and still be strong.
Try this: When you catch yourself asking “What if the scan is bad?” gently shift to “What can I do now?” Perhaps the answer is to write down a question, confirm when results will arrive, or return to an activity you value. You might also set aside a brief daily period for worries rather than allowing them to occupy every hour. If worries keep returning, that does not mean you are doing the exercise incorrectly.
Try this, too: For a quick way to settle your body, try a pattern called cyclic sighing. Breathe in through your nose, take a second short breath in to fill your lungs, then exhale slowly through your mouth. Repeat for a few minutes without forcing the breath. In one study, five minutes a day of this practice improved mood and slowed breathing more than mindfulness meditation. Stop if you feel dizzy or uncomfortable.
4. When You Want to Pull Away, Let Someone In
Cancer can make you feel alone even in a crowded room. You may avoid friends because you do not want to worry them, or because you are tired of answering questions. But close relationships can help regulate our response to stress. In brain-imaging research, holding the hand of a trusted partner reduced the brain’s response to an anticipated threat.
Try this: Instead of feeling you must explain everything, give someone one specific way to help. “Can you drive me Thursday?” “Would you sit with me while I wait?” “Could we talk about something other than cancer?” Connection does not require a long conversation. A shared meal, a short visit, or a hand to hold may be enough for today.
When to Ask for More Help
Understanding your brain is not a substitute for medical or mental health care. Cancer-related fatigue, pain, sleep changes, medications, and treatment effects can also affect mood and thinking. Persistent loss of pleasure, hopelessness, or anxiety deserves attention. Tell your oncology team, especially if symptoms interfere with daily life.
Counseling, supportive care, and treatment for depression or anxiety can help. In one study, a group program focused on finding meaning improved spiritual well-being and quality of life for people with advanced cancer. If you have thoughts of suicide or harming yourself, call or text 988 to reach the Suicide & Crisis Lifeline.
You Don’t Have to Think Positive All the Time
You do not have to be cheerful to be resilient. You can be frightened and still take the next step. You can feel uncertain and still make a choice. You can need help and still be strong.
Cancer may have changed the future you expected. It has not taken away your ability to build meaning into today.
Dr. Alex P. Michael is a board-certified neurosurgeon and assistant professor of neurosurgery at Washington University School of Medicine in St. Louis, MO. He writes about the neuroscience of resilience, motivation, and coping with adversity. You can read more at Websites.WashU.edu/AlexPMichaelMD.
