Rounder through the cheeks. Fuller under the jaw. Familiar, but rearranged, as though someone had adjusted a setting overnight without asking you.

And then the internet handed you a name for it. Cortisol face. A cause, a culprit, and a protocol, all in a fifteen second video shot in somebody else’s bathroom.

Here is the whole thing, unpicked, with the part that matters for you kept until the end.

The trend did not come from nowhere, and it is not stupid. It borrowed a genuine clinical picture. In Cushing’s syndrome the body is exposed to far too much cortisol, and one of the recognised signs is a rounding of the face along with a redistribution of fat elsewhere. Doctors have described it for the better part of a century. It is a proper diagnosis with proper tests.

What the trend did was take that picture and hand it to everybody. Stressful job, poor sleep, an unrecognisable face in the mirror, and the conclusion arrives ready-made: your stress hormone is doing this, and here is what to buy.

Cortisol is not the villain in that story. It is a hormone with a daily rhythm, high in the early morning and falling through the day, and it rises when you are under acute strain. That is the system working. There is no good evidence that ordinary stress produces a distinct facial appearance in people who do not have an endocrine disorder. Nobody has demonstrated a cortisol face outside the clinic.

Faces change for a long list of duller reasons. Fluid shifts overnight and settles where you were lying. Crying does it. Poor sleep does it. Alcohol, antihistamines, the point you are at in your cycle, a flare of anything inflammatory, and the ordinary work of getting older all do it.

And then there is the one that almost never appears in the videos, which is the reason this issue exists.

Corticosteroids. Prednisolone, dexamethasone, the long courses that keep autoimmune disease and asthma and bowel disease under control. Facial rounding is a known, documented effect of these medicines, and it is dose and time related rather than a sign that you have handled your stress badly. If your face changed after your treatment changed, that is very likely your answer, and it is not a moral one.

Which means the question is not whether you failed to manage your cortisol. It is this:

Today’s Practice

Two minutes, and none of it involves a mirror if you would rather it did not.

On a hard morning, do the first item and leave the rest. Reading your own medication list is a complete act on its own.

What the Research Says

Cortisol can be measured, though not in the way the adverts suggest. Blood, saliva and urine tests exist and are used in a specific sequence when a doctor suspects a disorder, because a single reading tells you very little against a hormone that changes hour by hour. Hair cortisol is studied as a marker of longer term stress and the findings are mixed, with legitimate questions about what hair colour, treatment and washing do to the result. A home kit cannot diagnose anything. It can only give you a number to worry about.

From the Old World

There is a custom in Jewish mourning of covering the mirrors in the house for the week of shiva. The explanations vary between communities, and one of them is plain enough to borrow. For seven days, the mourner is excused from her own reflection. Nobody is required to look at what grief has done to her face while she is still inside it. That is a generous piece of engineering, and it understood something that the algorithm does not, which is that a face under strain deserves privacy rather than analysis.

Come Home

Five lines, and none of them are about how you look.

One act for today, if you want one. Read your medication list once, with no conclusions attached to it. That is all it has to be.

That face in the mirror has been carrying a great deal for you. It does not also have to be evidence.

P.S. Tomorrow, White Dew. The Chinese solar term that began over a week ago and runs to the equinox, so while we are in the middle of it, it has something to say about a body that feels the cold early.