A decision is rarely a single mental act. It usually involves holding several options in mind at once, comparing them along several dimensions, checking them against how today is going, and remembering what has already been considered and discarded. Each of those is cognitive work, and several of them run at the same time. When brain fog is worse, the work becomes visible — which is why choosing a sandwich can genuinely feel like choosing a mortgage.

A second effect is less obvious: the effort spent is not retrievable. A morning spent deciding whether to reply to a message can cost the energy that the reply itself would have needed. Over the course of a day, decisions tax the same limited supply as everything else, and a day with many small choices in it can be as heavy as a day with one large task.

One thing this difficulty is not: indecisiveness, or a lack of interest in the outcome. The person hesitating over the appointment time usually cares about the appointment; the difficulty is in the machinery of choosing, not in the wanting. That distinction matters, because it points at what helps — reducing the load of the choice rather than motivating the chooser.

• What to eat — a decision that returns several times a day, involves comparing against symptoms, appetite, effort and what's in the house, and arrives precisely when the resources for it are lowest
• Whether to attend something — weighing the value of the event against its cost, without knowing today how either will look on the day
• Choosing an appointment time — a small scheduling choice that carries transport, time of day, the rest of the day's plan and how the following morning usually goes
• Replying to a message — when the reply requires working out the right thing to say, when to say it, and how much to explain
• Deciding which household task matters most — comparing urgency, effort and the consequences of each option not being done
• Online shopping — dozens of near-identical options, each requiring comparison on price, size, reviews and delivery, with no ceiling on how much checking is possible
• Travel choices — route, timing, assistance, where the unavoidable demands fall; a decision with several connected moving parts
• Deciding whether something can wait — the quiet background decision behind all the others, and often the most valuable one to get right

Two distinctions carry a lot of the weight when a decision is proving hard.

The first is urgency. Some decisions genuinely need a response today — a form with a deadline, a reply someone is waiting on, a symptom question that has changed. Many others feel urgent only because they arrived, not because they expire. Sorting a queue of pending decisions into “needs deciding now” and “can wait” often dissolves half of it, because the second pile can be set down properly rather than carried.

The second is reversibility. A decision that can be changed later — a temporary booking, a first attempt, a “let's try Tuesday and see” — can be made at much lower cost, because the wrong answer is not a disaster, just a revision. Where a choice is harder to reverse, the case for more processing time, and for narrowing it with someone trusted, is stronger. Treating the two types alike makes everything heavier than it needs to be.

The hardest category is often not choosing between good and bad options but between two necessary ones: the rest that is needed and the appointment that cannot be moved; the meal that requires standing and the evening that requires eating. There is no technique that dissolves a genuine trade-off, and it is worth saying plainly that some of these decisions are simply unfair, and the person making them is not failing when they find them hard.

What can help is shrinking whatever part is shrinkable: the appointment changed to a phone slot, the meal changed to something that needs no preparation, one of the two moved rather than both endured. A trade-off reduced in size is easier to make, even when it cannot be removed.

None of what follows is a system; it is a toolbox, for use in whatever combination the situation allows:

• Reduce the number of options — three is easier than thirty; two is easier than three
• Choose between two rather than many — “Tuesday or Thursday?” rather than “when suits you?”
• Keep familiar defaults — the same meal on hard days, the same delivery slot, the known option that requires no evaluating
• Write down the actual decision — naming the real question (“do I reply today or Monday?”) often reveals it is smaller than it felt
• Separate “needs deciding now” from “can wait” — and let the second list sit somewhere it is not re-read hourly
• Ask someone trusted to narrow the choices — two workable options presented to you, with the final choice still yours
• Make a temporary choice where possible — provisional beats postponed, because it can be revisited cheaply
• Revisit later when the decision is reversible — deliberately, with the morning version of yourself rather than the 9pm one

For the moments when a decision is circling, five questions can sometimes find the edges of it — not as a ritual, just as a way of locating the actual size of the thing:

Often the first or second question does most of the work — many circling decisions turn out to be “can wait” decisions wearing an urgent costume. If the fifth question is the one that applies, that is what it is for: decisions are one of the things that can legitimately be shared, and narrowing is not the same as handing over control.

Some decisions never resolve into a good answer. The choice between resting and seeing a person you love; between the task that will cause problems tomorrow and the task that is causing problems today. In these situations the useful reframe is that the decision is no longer “which option is right” but “which option is most workable” — the one whose costs fall where you can best carry them, or whose worst version is the most survivable.

Choosing the least demanding option is a legitimate decision-making strategy with this illness, not a cop-out. And when the outcome is imperfect — when the visit was too long, or the rest came too late — that is information about the situation, not a verdict on the deciding. The pages on Low-Energy Days and Planning Ahead cover what to do on either side of a hard call; this one only covers the call itself.

Everything above becomes more useful as it becomes more condensed, because the whole point is that the hard days need the short version: fewer options, familiar defaults, decisions genuinely deferred rather than half-carried, and — where someone is available — one question asked once rather than many questions held alone. For people at the severe end of the illness, decisions reduced to yes/no, or to a choice between two things someone else has prepared, can remain real decisions; the narrowing is support, and the final say still belongs with the person it affects.