Your hair hurting mid-migraine is a clock, and your tracker ignores it.

The glasses come off first

The glasses come off first. A little way into the attack, the arms of the frames start to register behind your ears as pain rather than pressure. Then the hair tie goes, because the ponytail is suddenly tugging at something raw. By the time you're lying down, the pillowcase against your cheek feels wrong, and brushing your hair is off the table until tomorrow.

Plenty of people with migraine know this stretch of an attack by heart. Very few have been asked about it.

It's rarely on an intake form. It isn't a checkbox in the tracker. And it almost never comes up in a short follow-up visit, which is strange, because skin sensitivity during an attack has a clinical name (cutaneous allodynia) and more than twenty years of research saying its arrival changes how well a triptan works.

Why does my hair hurt during a migraine?

The short answer: your pain system has turned its own volume up.

Early in an attack, nerve fibers around the blood vessels of the meninges become sensitized, which is why the throbbing gets worse when you bend over or take the stairs. If the attack keeps going, neurons further up the chain, in the brainstem, start amplifying ordinary signals too. A comb, a frame, a shower stream: touch that should feel like nothing gets processed as pain. That's central sensitization, and allodynia is how you feel it from the outside. When the sensitivity spreads past the head to the forearms or hands, Burstein's group ties that to the process reaching the thalamus.

We call this the allodynia clock.

Once your scalp starts hurting, the attack has moved into a phase that tends to respond differently to acute treatment. The symptom isn't a side note to the headache. It's a timestamp.

"Treat early" never says when early ends

The standard advice is to take acute medication early, while the pain is still mild. That's sound. But it hands you a pain score as the clock, and pain intensity and sensitization aren't the same measurement. A number out of ten can't tell you which side of the line you're on.

In the Burstein group's work, what separated a strong triptan response from a weak one was whether allodynia had set in. The usual early-treatment advice doesn't mention that marker at all, so people wait. They wait to see if it's "a real one." They wait until the meeting ends. They wait because insurance caps how many tablets they get each month and nobody wants to spend one on a false alarm.

The research isn't unanimous, and that matters. The allodynia finding is one group's work, not the final word on how any one person will respond. So read the clock as a strong signal with soft edges. It's still a signal almost nobody records.

What the numbers say

Three findings carry most of the weight here.

In 2000, Burstein and colleagues tested skin sensitivity directly during attacks and found allodynia in 79% of the migraine patients they studied (33 of 42). Later, the American Migraine Prevalence and Prevention (AMPP) study used a 12-item questionnaire, the Allodynia Symptom Checklist (ASC-12), and put the figure at about 63% of people with migraine (Lipton et al., 2008).

The treatment finding came in 2004. Burstein, Collins and Jakubowski reported that patients were pain-free two hours after a triptan in 93% of attacks treated before allodynia developed, compared with 15% of attacks treated once it was established. Small study, big gap.

Allodynia also matters beyond a single attack. Analyses of AMPP data have linked it to a higher risk of episodic migraine becoming chronic (Louter et al., Brain, 2013).

One attack, logged two ways

Picture an attack like this. Pain starts mid-morning at a moderate level. There's a meeting at eleven, the triptan is in a bag across the room, and the month's supply is already half gone. By early afternoon the glasses are off and the scalp is tender. That's when the dose goes in. Relief is partial.

In most trackers, that attack becomes three facts: a start time, a peak pain score, and "triptan, partial relief." Repeat it over a few months and the export reads like a drug that's losing its grip. A reasonable neurologist looking at that page might bring up switching medications.

Now add one line. "Skin sensitivity: yes, started around 1:30 p.m., before the dose." Put that line on the same attacks and the appointment goes somewhere else. The question becomes timing and access: why the dose keeps landing after sensitization, and whether the plan needs a different trigger point.

The drug may be fine. The window wasn't.

What changes when the scalp is on the record

If the allodynia clock holds up, "my rescue med stopped working" is sometimes a different sentence: "I treated past the window." Those two sentences lead to very different prescriptions.

It also gives a neurologist something to stage. Allodynia that shows up in more attacks over time, or starts reaching the arms, is the kind of detail that feeds a discussion about central sensitization and preventive treatment. Without it, they're working from pain scores and pill counts.

You don't need a lab to capture it. The ASC-12 asks about everyday contact, and its items work as a checklist for your own attacks. A useful entry has two parts: was it there, and when did it start relative to your dose?

If it isn't in the log, it didn't happen, at least to anyone with prescribing authority.

A symptom needs a timestamp to count

Most migraine trackers are built around the headache: when it started, how bad it got, what you took. Skin sensitivity rarely gets its own field, so it never makes the export, and it never reaches the appointment where it would matter.

Postdrome is built around a continuous symptom timeline that runs through the attack and the after-phase, so each symptom carries a time relative to the others and to your medication. That timing is the point. A symptom that shows up an hour before the pain, or lingers well after it, tells a different story than one that arrives with it.

Your data stays on your device. The app is a one-time purchase.

On your next attack, note when the glasses come off. That one timestamp gives your neurologist a sharper question than "did the triptan work?"