Your afternoon headache probably starts at your jaw
The band-around-the-head headache that arrives after lunch is rarely about your eyes or your screen. It is usually clenching, and you will not catch yourself doing it.
It arrives somewhere between two and four. A dull, pressing band across the forehead or around the sides, sometimes reaching down into the neck. Not sharp, not throbbing, not one-sided. Just a tightening that makes the last two hours of the day considerably worse.
Almost everyone blames the screen, which is why the first purchase is usually glasses. That is worth ruling out, and it is not where most of these come from.
What this kind of headache is
The pattern above describes a tension-type headache, which is the most common headache there is. The name is slightly unfortunate, because it points at stress when the mechanism is more mechanical than that.
The muscles involved are the ones nobody thinks about: the temporalis at your temples, the masseter along your jaw, and the suboccipitals at the base of the skull. Hold any of them at low effort for hours and they become tender, and tenderness in those particular muscles is felt as a headache rather than as a sore muscle. That is why it does not feel like it is coming from your jaw even when it is.
A useful separator: tension-type headaches are usually both sides, pressing rather than pulsing, and not made dramatically worse by walking upstairs. Migraine is more often one-sided, throbbing, worse with movement, and comes with light or sound sensitivity or nausea. They are different problems with different treatment.
Why the jaw
Daytime clenching is extremely common and almost entirely unconscious. It is not the same as night-time grinding, it leaves no marks anyone points out at the dentist, and people are usually surprised to learn they do it.
At rest, your teeth should not touch. Lips together, teeth slightly apart, tongue resting on the roof of the mouth. Most people at a keyboard, mid-concentration, are gently holding their teeth together instead. The masseter is one of the strongest muscles in the body for its size, and even a light hold sustained for an hour is enough to make it sore.
- Concentration. Difficult work, precise mouse movements and reading small text all recruit the jaw for no reason at all.
- Screen distance. Leaning in to read tends to bring a slight chin-forward position, which loads the muscles at the base of the skull.
- Phone and headset. Cradling a phone, or a headband gripping the temples for six hours of calls.
- Caffeine, and then no caffeine. Both raise muscle tone. A withdrawal headache from a missed afternoon coffee looks almost identical.
- Sleeping badly. Lowers your tolerance for all of the above rather than causing it directly.
How to tell which one you have
| What you notice | What it points to |
|---|---|
| Band across the forehead, both sides, builds through the afternoon | Tension-type. Jaw, temples and neck. |
| Aching temples, jaw tired when you eat, sometimes a clicking | Clenching, fairly clearly. Worth trying the tongue trick below. |
| Burning, gritty, tired eyes with the headache | More likely dry eye and screen work. See our piece on eye strain. |
| Blurred text that clears when you blink, or a headache only when reading | Worth an eye test. This is the one where glasses genuinely help. |
| Starts at the base of the skull and spreads forward | Suboccipital. Usually a screen height or duration problem. |
What actually helps
In order of how much they matter
- Learn where your jaw rests. Lips together, teeth apart, tongue on the palate. Check it whenever you notice, and you will be shocked how often your teeth were touching.
- Put a check on something you already do. Every time you pick up your cup, notice your jaw. Habits need an anchor, not willpower.
- Raise your screen and increase your text size. Both remove the reason you lean in, which removes the neck component.
- Break the sustained hold. Standing up every twenty to thirty minutes interrupts the low-level contraction before it becomes tender. This is the same intervention as for everything else at a desk, because it is the same underlying problem.
- Keep caffeine steady rather than heroic. Same amount, same time. The crash and the withdrawal both produce headaches.
Jaw stretching and massage help in the moment and do not do much for the pattern. They are worth doing when it hurts. They are not a substitute for noticing the clench at eleven in the morning.
The painkiller trap
This one is worth knowing about because it is common, easily avoided and genuinely miserable. Taking painkillers for headaches on more than about ten to fifteen days a month, for several months, can produce medication-overuse headache: a headache caused by the treatment, which feels like the original problem getting worse and so invites more tablets.
If you are reaching for something most working days, that is the point to stop managing it yourself and get it looked at properly.
When it is not your desk
A headache that comes on suddenly and severely, one that follows a head injury, or one with fever and a stiff neck, confusion, weakness, visual loss or a first seizure needs urgent medical attention rather than a stretch. A headache that is new and persistent after the age of 50, one that is worse on waking or when you cough or bend, and any headache that keeps changing its pattern should be seen by a doctor.
The short version
The band-shaped headache that shows up after lunch is usually muscles that have been quietly holding on since morning, and the jaw is the one doing it that you will never catch. Teeth apart, screen up, text bigger, and get out of the chair before the muscles have been contracted for three hours. Glasses are worth ruling out. They are rarely the answer.
