This is a different question from the one about a sudden flash of temper, and the difference is the timescale. A reaction four sizes too large on a Tuesday evening is a threshold event. A month of being slightly abrasive with everybody, including people you actively like, is a change in the floor — and floors move for a shorter and more boring list of reasons than individual evenings do.
So the first thing to do with it is not interpretation. It is a date.
What usually moves a baseline
Nothing has got more annoying. There is less of you to absorb it. This is almost never a change in the world and almost always a change in available tolerance, which is why the search for what has got worse comes back empty and leaves people concluding they have become a worse person. The same month, with eight hours a night in it, would have passed without comment.
The physical list is short, dull and frequently correct. Chronically short sleep. Pain of any kind, including the low-grade sort people stop reporting. A new medication or a changed dose. Alcohol most evenings. Iron, thyroid, and where you are in a hormonal cycle. Every item there produces genuine irritability, none of them is a psychological failing, and all of them are faster to check than a month of introspection — a short conversation with a doctor is, quite literally, the cheaper test.
Blood sugar is real and oversold at the same time. The effect of not having eaten on how pleasant you are does exist and has been measured; the folk version has it explaining a great deal more than it can. Whether being hangry is actually a thing goes through what the evidence supports, which is more than nothing and less than the word implies.
A demand that has not ended. Not a crisis — a crisis is survivable and has a shape. What erodes a baseline is the long one with no end date: the caring arrangement, the understaffed team, the sick parent, the house move that has been three weeks away for five months. Irritability is one of the most reliable outward signs of sustained load, and it tends to arrive earlier than tiredness does.
Something you are still agreeing to. This is the one people recognise with a jolt. A standing arrangement you said yes to and keep saying yes to — the weekend visits, the extra project, the task nobody else will take — generates a resentment that cannot be aimed at its actual cause, because its actual cause is a decision you are remaking every week. So it leaks sideways, onto people who have nothing to do with it.
A changed floor is also one of the ways low mood presents, and it gets missed. Weeks of being short with people, with sadness nowhere in evidence, is a recognised presentation rather than a rare one, and it is routinely overlooked. The entry on irritability covers how poorly the symptom is measured and why it points almost nowhere on its own, which is the honest state of the subject.
And the uncomfortable one: lately may mean other people started saying it. If the evidence is reports rather than your own sense of things, that is not a reason to discount the evidence. The people living with you hold a view of your baseline over time that you do not have, since they are the ones measuring from outside, and their account of when it changed is usually the more accurate one.
What to do this fortnight
- Put a date on it, to the nearest week. Then write down what was already happening by that date. The answer is frequently sitting in the first item on that list and has been visible the whole time.
- Do the physical checks first. Ten nights of proper sleep, a fortnight without alcohol, a blood test if it has been a while. Not because the psychological explanations are wrong, but because these are quicker to eliminate and it is demoralising to spend a month on the wrong one.
- Ask the household for data rather than a verdict. When it happens, how often, what was going on immediately before. People will supply a character assessment if you ask for one, so ask for times of day instead.
- Find the thing you are still agreeing to, and either stop agreeing or stop resenting. Both are genuinely available. Continuing to do both at once is what produces the abrasiveness.
- Lower the total load for two weeks with a stated end date, and watch whether it moves. Not as self-care — as a test. If a quieter fortnight restores your floor, the answer was the load rather than your character, and that is worth knowing before you apologise to anybody for who you have supposedly become.
- And the line worth naming out loud: if your anger has started to frighten the people near you, or if anything has been thrown or threatened, the timescale stops mattering and it is time to get help with it now, for their sake. That is not a judgement about you; it is the one situation where working on it privately is the wrong plan. If the fear in your house is of somebody else's anger rather than your own, that has its own route — in the United States, the National Domestic Violence Hotline on 1-800-799-7233, or START by text to 88788; in the UK, 0808 2000 247. Both are free and open at any hour, and neither asks you to have made a decision first.
What it depends on
Two readings a month apart tell you more here than any amount of thinking about last Tuesday. That sounds like a small point and it is the whole structure of the problem: lately is a comparative claim, memory for emotional baselines is poor and gets rebuilt out of how today went, and the only way to settle whether the floor has genuinely moved is to have measured it twice.
The check gives you the first of those readings with the parts separated — how low the floor currently sits, how long a shift stays once it has happened, and how much of it the people around you are absorbing. If what is underneath turns out to be fear or hurt rather than anger, the entry on what anger sits on top of is the better room for that. And if the pattern is not a changed baseline at all but single disproportionate episodes with no warning, that question has its own page.