As heads of Arab and Islamic states meet in Riyadh, Trump's victory raises questions for the region.

Want to stay current with Arthur’s writing? Sign up to get an email every time a new column comes out.

“If [X candidate I hate] wins this election, I will leave the country” is a sentiment we’ve heard from a few politically outspoken celebrities in recent presidential-election cycles. They never seem to follow through on the promise, though. That’s because it probably isn’t really a promise, but rather a defense against an emotion that humans truly hate: disappointment. They are soothing themselves with a strategy to neutralize anticipated feelings of impotence and frustration if the dreaded event comes to pass.

So if your preferred candidate lost on Tuesday night, you might be enduring that terrible emotion. Some people suffer from the malady so badly that they may be diagnosed with a condition popularly known as “post-election stress disorder.”

Even if all of this seems exaggerated, you probably do dread some source of disappointment in your life. Perhaps it involves your career, your education, or your romantic relationship. If so, you are very likely acting in a way that protects you from this deep and painful emotion; some research has found that disappointment can be associated with post-traumatic stress disorder. Understanding this phenomenon can help lower the fear of your own emotions, however, and help you make decisions leading to better outcomes. That may even help you avoid making a silly public promise to leave America.

[Read: What to watch if you need a distraction this week]

As two scholars described it recently in the Annual Review of Anthropology, disappointment is “the messy, friction-filled, and unsatisfying gap between lived experiences and expectations that have not come to pass.” The feeling is similar to regret, in that it involves a past event that didn’t turn out the way you had hoped. But whereas regret involves wishing you had done something differently, disappointment does not necessarily involve your decision-making agency. Because of this distinction, psychologists writing in the journal Cognition and Emotion find that regret more often leads to self-reproach, in contrast with the usual unhappiness associated with disappointment, which comes from a sense of powerlessness.

For example, you might vote for a candidate and regret it (that is, reproach yourself for doing so). But if the candidate for whom you voted loses, that can also give you a sense that you have no say over how you are governed—that’s where the powerlessness comes in.

The above research casts additional light on the psychological dimension of this difference between regret and disappointment. If a person disappoints you, that typically results in your feeling anger. But if an outcome is the disappointment, that is usually accompanied more by sadness.

Such findings tend to focus on what psychologists call “disconfirmed expectancies,” meaning a difference between what you think will or should happen and what actually happens. This involves the neuromodulator dopamine, which governs both rewards and the anticipation of rewards in our brains.

How this works: Imagine that at about 11 a.m., your stomach growls and you think about lunch. Your mind goes to a turkey sandwich you enjoyed last week from a local deli, which gives you a response from dopamine neurons to elicit anticipation and make you form a plan to go there at noon. If, when you arrive and get the sandwich, it is just what you expected, you get no additional dopamine response. But if the sandwich is even more delicious than you remembered, you will get an extra neurochemical spritz, which teaches you to come back again. But if the deli is closed, God forbid, your dopamine response will drop, making you feel mildly depressed—or, in a word, disappointed.

The mechanism no doubt evolved to teach us the most efficient way to accumulate rewards such as food and mates, and avoid wasting time and energy on fruitless activities. In ancient times, this reward system would keep you coming back again and again to a water hole where prey was easy to find. But if those animals caught on and stopped showing up, you would have a couple of disappointments and lose interest.

The most psychologically painful disappointments are those in which the hope of reward contrasts most sharply with the actual outcome. The closed deli involves a minor dopamine dip from which you’ll probably recover in minutes. But if, say, you truly expect your beloved to propose marriage and instead they skip town on you, the dopamine deficit will be a lot more severe and harder to endure—perhaps leading to a period of anhedonia, the inability to feel pleasure that is characteristic of dysregulated dopamine levels and clinical depression.

Disappointment is especially severe for optimists: They predict outcomes that are above average, and much better than any negative occurrence. This means that they tend to have bigger “disconfirmed expectancies” than non-optimists. Writing in the journal Emotion in 2010, two psychologists studied how students felt before and after receiving exam results. They found that people with more optimistic expectations did not feel better than their peers beforehand, but did on average feel worse after learning their scores, because the optimists tended to be further from reality.

[Arthur C. Brooks: Schopenhauer’s advice on how to achieve great things]

Our lives are filled with uncertain outcomes, often involving the things we care about most deeply. To have any positive expectations means that disappointment is part of life. This has led some thinkers to conclude that the only answer is pessimism. The 19th-century philosopher Arthur Schopenhauer famously made this case when he argued that “we generally find pleasure to be not nearly so pleasant as we expected, and pain very much more painful.” One conclusion from that: Expect nothing good ever, or even expect the worst, and you will never be disappointed.

Then again, Schopenhauer was well known for being a miserable person, so that may not be the best strategy. Better, I believe, to maintain hope amid life’s uncertainties—but to distinguish hope from optimism. Many people use the terms almost interchangeably, but they are different. Optimism involves an element of prediction—as we just saw, expecting a good outcome in a way that may be borderline delusional. Hope involves a belief that even if a disappointing result to a situation occurs, you can do something to improve that outcome—in the words of one team of researchers on the subject, “having the will and finding the way.” Because of this, as I have written, hope is far superior to optimism where happiness is concerned.

Hope does not require that you make any prediction at all about what might happen. It simply asks that you believe that whatever happens, you will have the ability to make circumstances better and you can give some thought to what that action might be.

In an odd way, this is halfway what people are doing when they announce a plan to leave America if the wrong candidate wins the election. But the contemplated action—leaving home and going into exile—is foolish and extreme; much better would be to say, “If the bad guy wins, I will be disappointed, but regardless of the disappointment, I will work as much as I can to make things around me better.” The same is true for other letdowns in life. If you’re yearning for a big promotion, don’t predict whether you will or won’t get it. Just be honest with yourself that you hope for the reward, and think logically about what constructive action you can take if, in fact, you are passed over.

In addition, because disappointment is part of the useful neurobiological learning process that you’ve inherited for your evolutionary fitness, look for the valuable lessons of a setback. The psychiatrist Carl Jung believed that when we are disappointed, we can actually choose between bitterness and wisdom—the latter being “the comforter in all psychic suffering.”

The problem with the leave-the-country approach is that it succumbs to bitterness instead of looking to learn. The same goes for a disappointment such as a bad breakup. The bitter response is “I’ll never date again.” A wise response is to figure out how to avoid getting entangled in future with a person who shares your ex’s problematic traits (that jerk).

[Arthur C. Brooks: Jung’s five pillars of a good life]

I wrote this column to soothe anyone who might be suffering from postelection disappointment, and to provide a better way to cope. But perhaps you aren’t disappointed: Maybe your candidate won, and you’re elated right now. That can also be an opportunity for wisdom—if you choose to take it.

Today you taste victory, but remember: Defeat is just around the corner, because that’s how life works. Reflect on this truth, and take the opportunity to show some grace to the neighbors and family members whose candidate lost and who are disappointed—because they’re feeling today the way you will surely feel tomorrow. Think of this as a chance to time travel, and bring a bit of kindness to comfort your future disappointed self.