In oncology and survivorship care, one of the most common (and often least visible) experiences patients carry is fear of recurrence.

For many people, finishing treatment brings a sense of relief. But it can also bring something quieter that lingers. A watchfulness. A heightened sensitivity to the body. A subtle shift in how the future feels.

For others, this way of thinking begins earlier (at diagnosis, during treatment, or in the spaces between appointments), any time the future feels uncertain and important. And often, it takes the form of a question that begins with two words:

What if.

What if it’s back? What if this pain means something? What if the next scan shows bad news? Or earlier: What if this is serious? What if the treatment doesn’t work? What if I can’t handle it?

In clinical settings, these questions often arrive all at once. And for clinicians, they can be difficult to answer, not because they are unimportant, but because they are often being asked at a moment when clear answers do not yet exist. The treatment has just begun. The scan has not yet been done. The outcome is still unfolding.

There can be a quiet tension in the room. Patients are reaching for certainty. Clinicians are trying to stay grounded in what is actually known. And in that space, both can feel the pull, toward answering too quickly, or toward trying to quiet questions that are not easily resolved.

If these thoughts sound familiar, they are not unusual. They are a very human response to living with uncertainty when something important is at stake.

In my work with patients across the cancer continuum, “what if” thoughts are often less about what is happening medically in the moment and more about how the mind tries to manage uncertainty about the future. And when we look closely at the thoughts that follow those two words (“what if”), two familiar patterns often appear. I sometimes give them names: Protective Paula and Catastrophic Cathy. Both voices are trying to protect something that matters.

Protective Paula sounds like this: Let’s go to follow-up appointments. Let’s pay attention to new symptoms. That feels different. We should monitor it. Paula helps patients stay engaged in their care.

Catastrophic Cathy sounds different: What if this is recurrence? What if they missed something? What if this time it’s worse? Or earlier in the experience: What if this changes everything? Cathy’s strategy is anticipation. If she imagines the worst ahead of time, maybe it won’t come as a surprise. But anticipating the worst rarely reduces uncertainty. More often, it simply asks patients to suffer in advance.

Many people notice these thoughts becoming louder in the days leading up to a scan, what patients often call scanxiety. But similar spikes can happen any time there is waiting: waiting for results, waiting for answers, waiting for the next step. In those moments, Cathy may begin whispering: This is the one. You already know. Start preparing. Sleep becomes lighter. Anxiety rises. The mind begins rehearsing worst-case scenarios. None of this means something is wrong. It means the mind is trying to protect something that matters.

Sometimes these thoughts show up in the quietest moments. I once worked with a patient who told me bedtime had become the hardest part of her day. During the day, she was steady, busy with work, friends, and the ordinary rhythm of life. But when the lights went out, and the room grew quiet, Cathy would show up. What if it’s back? What if that ache meant something? Soon, Protective Paula joined in, suggesting she review symptoms again or look something up online. She described feeling responsible, as if staying mentally vigilant was part of surviving. As if letting her guard down, even for a moment, might be the moment something was missed. As if rest itself carried risk.

What eventually helped wasn’t answering the thoughts. It was learning to pause and say something simple: “This is not the time, ladies. Chillax.” Not because the fear wasn’t real, but because nighttime isn’t the moment to decide the future.

Even when a scan comes back clear, fear doesn’t always disappear. Often, it simply shifts into the space between appointments. A different question emerges: What if something is happening right now and we don’t know? It can begin to feel like it’s the patient’s job to keep watch. To notice everything. To stay one step ahead. To not miss anything. But over time, that kind of vigilance becomes something heavy to carry alone.

Part of the work in cancer care is helping patients remember that they are not the only ones watching. Their medical team is watching with them. And sharing that responsibility matters. It means patients do not have to carry the entire burden of vigilance inside their own minds.

Sometimes Protective Paula begins working overtime, encouraging constant research, repeated body-checking, or ongoing reassurance seeking. At first, that can feel responsible. I often hear patients describe this shift without quite naming it. What begins as care slowly starts to feel like pressure. What once felt like staying on top of things begins to feel like never being able to step away. Over time, the goal quietly shifts, from staying informed to trying to eliminate uncertainty altogether.

Cancer teaches something difficult but important: Complete certainty is rarely possible. At its core, both catastrophe and over-control are attempts to regain certainty. But part of living with, and alongside, cancer is learning something deeper: Certainty and uncertainty both exist here. And the work becomes learning how to live alongside that uncertainty.

When a “what if” thought appears, it can help to ask a simple question: Who’s talking right now? Is it Catastrophic Cathy, turning possibility into certainty? Is it Protective Paula, offering proportion? That small moment of awareness creates space between the thought and what happens next. And in that space, balance becomes possible again.

For clinicians, this can also be a shift in role: from feeling responsible for answering every question to helping patients find a different way to hold the questions that cannot yet be answered. Because having “what if” thoughts does not mean a patient is failing to cope. It means their mind is trying to protect something that matters.

Protective Paula and Catastrophic Cathy will continue to do their jobs. That is what they were built to do. The work is not stopping them. The work is noticing when they begin to pull someone somewhere they do not need to go. Patients do not have to follow every “what if” into the future. They do not have to solve uncertainty in order to feel steady again. They can come back to what they know. What is here. What is actually happening right now. What is within reach in this moment. And from there, they can choose where to place their attention next.

What if will always have a voice. But patients do not have to go down the rabbit hole with it.

Jae L. Ross is a clinical psychologist.