Why do I get migraines before my period?
Start your consultation ›If your headaches arrive like clockwork in the days before your period, you are not imagining the link. Migraine is one of the most common reasons women dread the run-up to their period, and hormones are usually the reason why.
This guide explains why period migraines happen, how they differ from a PMS headache, how to tell whether yours are hormonal, and the treatments that can help you regain control.
Most period migraines are caused by a sudden drop in oestrogen in the days before your period starts. This hormonal change affects brain chemicals involved in pain signalling and can trigger migraine attacks in susceptible women.
Menstrual migraines typically strike from two days before bleeding begins until three days after, and can be more severe and longer-lasting than other migraines.
Throughout the month your hormone levels naturally rise and fall. In the second half of your cycle, oestrogen begins to fall if pregnancy does not occur, and this drop becomes particularly rapid in the few days before your period.
It helps to think of the brain as sensitive to changes in hormone levels rather than the level itself. It is usually the fluctuation, not the absolute amount, that causes the problem.
PeriodDay 14
OvulationDay 28
Drop
Oestrogen influences several brain chemicals involved in pain processing, when it drops, all three can shift at once:
Helps regulate pain signals. When oestrogen falls, serotonin can drop too, leaving the brain more vulnerable to an attack.
A key driver of migraine. Hormonal changes can increase CGRP activity, amplifying migraine symptoms.
Oestrogen influences blood-vessel tone and inflammation. Shifts here raise the likelihood of a migraine.
A menstrual migraine occurs around the time of menstruation due to hormonal changes. There are two main patterns:
Migraines occur only around menstruation, with no attacks at other times of the month.
Migraines occur through the month but become significantly worse around periods. This is the most common pattern.
Period migraines feel similar to other migraines but can be more intense, and often last longer and respond less well to standard pain relief. Common symptoms include:
Many women use the terms interchangeably, but they are different conditions, and the treatment can differ too.
The simplest way is to keep a migraine diary for two to three months, tracking your migraine days, cycle dates, symptom severity, triggers, sleep and stress. Clear patterns usually emerge.
Treatment depends on how frequent and severe your symptoms are, and generally falls into three approaches.
Taken when an attack starts, and most effective taken early. Targets the migraine once it has begun.
For predictable, cycle-linked attacks, treatment taken across your high-risk days to head migraines off.
Steadies the hormone swings behind the attacks, aiming for more stable oestrogen levels month to month.
Speak to a healthcare professional if:
- Your migraines are becoming more frequent
- Symptoms are affecting daily life
- Your headaches have changed significantly
- You develop aura symptoms for the first time
- You are approaching perimenopause and symptoms are worsening
New or unusual headaches should always be assessed to rule out other causes.
Why do I get migraines just before my period?
The most common reason is a rapid drop in oestrogen before menstruation. This hormonal change affects brain chemicals involved in migraine development.
How many days before a period can a migraine start?
Most menstrual migraines occur between two days before menstruation and three days after bleeding begins.
Why are period migraines worse than normal migraines?
Hormonal migraines are often associated with greater inflammation, longer attacks and a reduced response to standard pain relief.
Can hormonal migraines start in your 40s?
Yes. Hormonal migraines can first appear or worsen during perimenopause due to fluctuating hormone levels.
Will my migraines stop after menopause?
Many women experience significant improvement after menopause when hormone levels become more stable, although this is not the case for everyone.
If your migraines consistently appear before your period, hormones are likely playing a significant role. Understanding your pattern helps you predict attacks, access the right treatment and regain control.
You do not have to simply put up with hormonal migraines. Effective treatments are available, and understanding the role of oestrogen is often the first step towards relief.