Why are migraines get worse during monsoon? Neurologist explains how rain, humidity and weather changes trigger headaches

New Delhi: For many people, the first sign of an approaching monsoon shower is the smell of wet earth, cooler air and dark clouds gathering overhead. For some migraine sufferers, however, the warning can be very different: a throbbing headache, nausea, sensitivity to light or sound – sometimes beginning even before the rain arrives.

So, can the monsoon actually trigger migraine?

The short answer is: it can for some people, but rain itself is not a direct or universal cause of migraine. Weather sensitivity varies considerably between individuals, and research suggests that changes in atmospheric conditions may increase the likelihood of an attack in a subset of people with migraine. A 2025 systematic review of 14 studies involving 2,696 participants found some evidence linking drops or fluctuations in barometric pressure with increased migraine frequency, but concluded that the overall evidence remains limited and inconsistent.

Talking to News9 Live, Dr Bhaskar Shukla, Senior Consultant Neurologist at PSRI Hospital, New Delhi, explains several environmental and lifestyle changes that accompany the rainy season can make attacks more likely in people who are already susceptible to migraine.

Is falling atmospheric pressure the culprit

One of the most discussed links between weather and migraine is barometric, or atmospheric, pressure.

Dr Shukla says, “As weather systems move in, atmospheric pressure can change – particularly around storms and rainfall. Some people with migraine appear to be sensitive to these fluctuations.”

The American Migraine Foundation identifies changes in barometric pressure as a potential migraine trigger, while studies have found that only a subgroup of migraine patients appears to have clear weather sensitivity.

A large 2023 study using data from more than 40,000 people also found associations between headache occurrence and several weather variables, including lower barometric pressure, changes in pressure, higher humidity and rainfall. However, an association does not prove that rain or pressure changes directly cause an attack.

“Weather changes can act as a trigger in people who are already susceptible to migraine,” explains Dr Shukla rather than meaning that rain itself causes the neurological disorder, is the more accurate way to understand the phenomenon.

Humidity may add to the problem

Monsoon weather brings high humidity, and that can create another potential problem.

High humidity and heat can increase sweating and fluid loss. At the same time, people may not always feel as thirsty during cloudy or cooler weather and may consequently drink less water.

“Dehydration is a well-recognised migraine trigger.”, mentions Dr Shukla. The American Migraine Foundation notes that dehydration is reported as a trigger by a substantial proportion of people with migraine and recommends maintaining adequate hydration as part of migraine management.

Research has also found an association between higher relative humidity and migraine onset during warmer months, although the relationship is not uniform across all studies or all patients.

In other words, it may not be the rain falling outside that is responsible. It could be the combination of humidity, sweating, reduced fluid intake and other changes happening at the same time.

The monsoon-migraine connection is more complicated than weather

Weather is only one piece of the puzzle.

Rainy days can alter everyday habits. People may wake later, exercise less, skip meals, spend more time indoors, consume more tea or coffee, sleep at unusual times or experience more stress because of traffic and disrupted travel.

All of these factors matter because migraine is sensitive to changes in routine.

Skipping meals and fasting can lower the threshold for an attack, while irregular or insufficient sleep is another recognised trigger. Caffeine can be particularly tricky: excessive intake can trigger migraine in some people, while sudden caffeine withdrawal can also provoke an attack.

This means that a rainy morning followed by a skipped breakfast, several cups of tea, inadequate water intake and a late night could create a very different migraine risk profile from a rainy morning in which someone has slept well, eaten regularly and stayed hydrated.

Mould, smells and indoor air can also play a role

The monsoon changes the indoor environment too.

Persistent dampness can encourage mould growth, while closed windows and increased time indoors can increase exposure to household odours, cleaning products and other strong smells.

Strong smells are among the potential triggers reported by people with migraine. Seasonal allergies can also complicate the picture, with nasal symptoms sometimes occurring alongside migraine.

But this is another area where caution is needed. Not every person exposed to mould, humidity or a particular smell will develop migraine, and some experiences that people identify as “triggers” may actually be early symptoms of an attack.

Dr Shukla has increasingly recognise that identifying migraine triggers is not always straightforward. Certain food cravings, sensitivity to light or smells and other changes can sometimes occur during the prodrome which is the early phase of a migraine, rather than actually causing the attack.

Migraine is more than “just a headache”

A migraine attack is not simply an ordinary headache made worse by rain.

Typical migraine pain is often throbbing or pulsating, may occur on one or both sides of the head and can be accompanied by nausea, vomiting and sensitivity to light or sound. An untreated attack can last anywhere from four to 72 hours.

Some people also experience aura before or during the headache.

Aura can cause temporary visual symptoms such as flashing lights, zigzag patterns or blind spots. It can also cause tingling or numbness and, in some cases, difficulty speaking. Aura symptoms generally develop gradually and usually last less than an hour.

Not everyone with migraine experiences aura, and not every attack follows exactly the same pattern.

What can you do if rain seems to trigger your migraine

The most useful first step is not necessarily to avoid the rain — it is to understand your individual pattern.

A headache diary can help establish whether attacks repeatedly occur around changes in weather, sleep, meals, hydration, stress or hormonal cycles. The American Migraine Foundation recommends keeping track of symptoms and possible triggers because migraine triggers can be highly individual and may occur in combinations rather than isolation.

During monsoon, people prone to migraine can focus on a few basics:

• Stay adequately hydrated, particularly if sweating more than usual.
• Do not skip meals, especially breakfast.
• Keep sleep timings as consistent as possible.
• Avoid sudden major changes in caffeine intake.
• Track rainfall, humidity and other weather conditions alongside headache symptoms.
• Identify personal triggers rather than assuming every rainy day will cause an attack.
• If you have prescribed acute migraine medication, taking it early in an attack may make treatment more effective.

For people with frequent or disabling attacks, lifestyle changes alone may not be enough. Doctors can consider preventive treatments depending on the frequency, severity and characteristics of the migraine.

Be careful with painkillers

One of the biggest mistakes people can make during a period of frequent headaches is repeatedly reaching for painkillers without medical guidance.

Frequent use of acute headache medication can contribute to medication-overuse headache, creating a cycle in which headaches become more frequent and medication provides increasingly temporary relief.

Mayo Clinic notes that medication-overuse headache can occur in people with an underlying headache disorder who use acute medicines too frequently. The risk varies by medication; for example, simple painkillers may pose a risk when used on 15 or more days a month, while triptans and certain combination medicines can cause problems at lower frequencies.

If someone finds they need headache medicine repeatedly – particularly more than twice a week – it is worth discussing the pattern with a doctor rather than simply increasing self-medication.

When is a monsoon headache a medical emergency

Not every headache during the rainy season should be blamed on migraine or the weather.

A sudden, extremely severe headache, particularly one that reaches maximum intensity very quickly, requires urgent medical assessment.

Immediate medical attention is also warranted when headache is accompanied by symptoms such as weakness or numbness, confusion, seizures, difficulty speaking, double vision, fainting, fever with a stiff neck, persistent vomiting or a significant change from a person’s usual headache pattern. Headache following a head injury also requires medical evaluation.

New neurological symptoms, particularly sudden speech difficulty, weakness or loss of vision, should never simply be attributed to a weather-triggered migraine, even in someone who has a history of migraine.