Frequent headaches: when should you see a doctor?

Headache is one of the most common neurological complaints. Most people experience it at least occasionally, but recurring or worsening headaches can seriously interfere with work, study, physical activity and everyday functioning. According to the World Health Organization, headache disorders affect around 40% of the world's population, and migraine remains one of the leading causes of neurological disability.

A frequent headache does not have to mean a serious illness. Most often it is linked to a primary headache such as migraine or tension-type headache. Even so, it should not be automatically written off as stress, dehydration or tiredness, especially if it started recently, changed its character or comes with other worrying symptoms.

What matters is not only the intensity of the pain, but also how it started, how often it occurs, how long it lasts, the accompanying symptoms and any change in your usual pattern.

A headache is a symptom, not a single specific disease

Headaches are divided into two main groups.

Primary headaches are disorders in their own right. The most common are:

• migraine,
• tension-type headache,
• cluster headache.

Secondary headaches result from another health problem. They can be linked to, among other things, infection, injury, an eye condition, vascular disorders, medication effects or changes in intracranial pressure.

The location of the pain alone is usually not enough to establish its cause. Pain around the forehead does not have to mean a sinus problem, and one-sided pain is not always a migraine. The doctor considers the whole picture of symptoms.

The most common types of recurring headaches

Tension-type headache

Tension-type headache is usually:

• bilateral,
• pressing or tightening,
• mild or moderate,
• non-pulsating,
• not clearly worsened by ordinary activity.

It may be described as a band, ring or pressure around the head. It is usually not accompanied by vomiting or clear neurological symptoms. A single episode can last from about 30 minutes to many hours, and sometimes persists almost constantly.

The name "tension-type" does not mean the cause is always emotional or muscular tension. Stress can be one factor linked to the pain, but it is not the only possible explanation. As with chronic fatigue, it is worth looking at your lifestyle as a whole before treating the symptom as obvious.

Migraine

Migraine is a neurological disorder, not simply "a very bad headache". A typical migraine attack lasts from 4 to 72 hours and may involve:

• throbbing pain,
• one-sided or bilateral pain,
• moderate or severe intensity,
• worsening with ordinary activity,
• nausea or vomiting,
• sensitivity to light and sound.

Not every migraine is one-sided, and not every attack has all of these features.

Some people experience migraine aura. It may include flashing lights, zigzags, blind spots in the field of vision, numbness, tingling or speech disturbance. Typical aura symptoms are fully reversible, develop gradually over at least 5 minutes and usually last from 5 to 60 minutes.

However, first-ever disturbances of vision, speech or sensation should not be self-diagnosed as migraine. Sudden neurological symptoms in particular require urgent assessment, as they can resemble, among other things, a stroke or transient ischaemic attack.

Cluster headache

Cluster headache is much rarer but usually very intense. A typical attack:

• affects one side of the head, most often around the eye or temple,
• lasts from 15 to 180 minutes,
• can occur several times a day,
• causes restlessness or agitation,
• may involve tearing, a red eye, a runny or blocked nose, a drooping eyelid or a constricted pupil on the painful side.

A first episode consistent with cluster headache should be assessed by a doctor. Guidelines also recommend considering imaging at the first bout of attacks.

Medication-overuse headache

Paradoxically, frequent use of painkillers can sustain or worsen headaches. Medication-overuse headache should be considered when symptoms developed or worsened during at least 3 months of using:

• triptans, opioids or combination medications on at least 10 days a month,
• paracetamol, aspirin or non-steroidal anti-inflammatory drugs on at least 15 days a month.

What matters is the number of days on which medication is taken, not only the number of tablets.

This does not mean that everyone who takes painkillers a few times a month will develop this problem. A rising frequency of use is, however, an important signal to discuss treatment with a doctor rather than gradually increasing doses or reaching for more products.

What does a "frequent" headache mean?

There is no single number of attacks after which everyone should urgently get tested. For one person, two attacks a month can make functioning impossible, while for another, more frequent but mild headaches have little effect on daily life.

A consultation is advisable when the pain:

• returns regularly,
• interferes with work, study, sleep or activity,
• requires increasingly frequent use of medication,
• becomes stronger or lasts longer,
• has a different character than earlier headaches,
• causes frequent absences from work or forces you to give up on plans,
• does not respond to current treatment.

Chronic headache is defined as headache on at least 15 days a month for more than 3 months. Chronic migraine is diagnosed when, during that period, at least 8 days a month have migraine features.

It is not worth waiting until the pain reaches this frequency. An early consultation can make it easier to reach a diagnosis, choose treatment for the attacks and assess whether prevention is needed.

When is it worth booking a routine medical consultation?

It is worth seeing a family doctor or neurologist when:

The headaches return regularly

Recurring headaches may be a symptom of migraine, tension-type headache or another primary disorder. An accurate diagnosis matters, because treatment differs between types of headache.

The pain starts to affect daily life

An important criterion is not only the number of attacks, but also their impact on functioning. A consultation is justified if the pain forces you to stop work, lie in a dark room, cancel meetings or give up activities.

Painkillers are needed more and more often

Regular use of as-needed medication increases the risk of medication-overuse headache. In such cases, a change in the treatment approach may be needed rather than another painkiller.

A previously familiar headache changes character

A clear change in location, intensity, duration or accompanying symptoms warrants a consultation. A gradually rising frequency or intensity is particularly important.

The headache appears for the first time after age 50

A new type of headache after the age of 50 is one of the red flags that require closer assessment. It does not automatically mean a serious illness, but it may influence the decision about further diagnostics.

The pain appears with coughing, sneezing, exertion or a change in position

Pain triggered by coughing, straining, sneezing or exertion, as well as pain clearly dependent on body position, should be discussed with a doctor. Pain that worsens on standing up and eases on lying down may need a different approach than typical migraine.

There is cancer or a weakened immune system

A new headache in a person with cancer, HIV infection, after a transplant or taking immunosuppressive drugs requires faster assessment.

The headache comes with unexplained vomiting

A new headache combined with vomiting that cannot be explained by infection, poisoning or another obvious cause is an indication for further assessment.

When does a headache need urgent care?

Some symptoms should prompt immediate or very urgent medical assessment.

Sudden, exceptionally severe pain

Especially worrying is pain that:

• starts suddenly,
• reaches maximum intensity within a few minutes,
• is described as the worst pain of your life,
• clearly differs from earlier complaints.

Such pain, sometimes called thunderclap headache, may require immediate investigation for subarachnoid haemorrhage and other acute vascular disorders. NICE treats pain reaching maximum intensity within 5 minutes as a red flag, and the ACR recommends urgent imaging for sudden, very severe pain.

New neurological symptoms

A headache combined with sudden:

• weakness or paralysis of a limb,
• drooping of the corner of the mouth,
• speech disturbance,
• loss or disturbance of vision,
• loss of balance,
• confusion,
• impaired consciousness,

requires urgent care. A new neurological deficit, cognitive impairment, change in behaviour or reduced level of consciousness are among the symptoms that need rapid diagnostics.

Typical migraine aura usually develops gradually and is fully reversible. Sudden neurological symptoms, especially first-ever ones, should not be self-attributed to migraine.

Pain after a head injury

New or worsening pain after a head injury, especially combined with drowsiness, impaired consciousness, vomiting or neurological symptoms, requires urgent consultation. NICE also draws attention to injuries sustained within the previous 3 months.

Pain with fever and worsening general condition

A worsening headache combined with fever may require ruling out a central nervous system infection or another systemic illness. Impaired consciousness, marked drowsiness and a rapid deterioration in general condition should be particularly concerning.

Severe eye pain, redness and vision disturbance

A headache combined with a very painful, red eye, blurred vision, seeing coloured halos around lights, nausea or vomiting may indicate an acute attack of angle-closure glaucoma. This condition requires urgent ophthalmological care.

A new headache in pregnancy or after childbirth

A new, unusual or very severe headache during pregnancy and the postpartum period requires greater caution. React especially urgently when it comes with vision disturbances, raised blood pressure, pain under the right rib margin, marked swelling, breathlessness, vomiting or feeling unwell.

Severe pain can be one of the symptoms of pre-eclampsia. Pre-eclampsia can also appear after childbirth, most often within a few days, but even up to 6 weeks after delivery.

A new headache pattern in pregnancy or the peripartum period is also one of the situations in which imaging is more often considered.

A new headache after age 50 with jaw pain or vision disturbance

A new headache in a person over 50, especially combined with:

• scalp tenderness,
• jaw pain when chewing,
• worsening or loss of vision,
• systemic symptoms,

may suggest giant cell arteritis. This condition requires urgent diagnostics because of the risk of permanent vision loss.

Does a frequent headache mean you need an MRI?

Not always.

In a person with a typical picture of migraine or tension-type headache, a normal neurological examination and no red flags, routine CT or MRI is usually not recommended. NICE guidance states that imaging should not be performed solely to reassure the patient when a typical primary headache has been diagnosed. The ACR considers imaging usually inappropriate in typical migraine or tension-type headache with a normal neurological examination.

Imaging is considered more often when red flags are present, such as:

• sudden onset,
• rising frequency or intensity,
• neurological deficit,
• fever,
• cancer,
• reduced immunity,
• a new headache after age 50,
• injury,
• a new type of headache in pregnancy or after childbirth,
• features of raised or lowered intracranial pressure.

The choice between CT, MRI, vascular studies or other tests depends on the suspected cause and the urgency of the situation. This fits the idea of preventive medicine: tests are chosen deliberately, based on symptoms, rather than just in case.

How to prepare for the appointment?

One of the most useful tools is a headache diary. NICE recommends keeping one for at least 8 weeks for diagnostic purposes, unless the patient's condition requires earlier urgent diagnostics.

In the diary it is worth recording:

Information	What to note
Date and time	When the pain started and ended
Intensity	For example from 0 to 10
Location	One side, both sides, around the eye, the back of the head
Character	Throbbing, pressure, stabbing, burning
Additional symptoms	Nausea, light sensitivity, numbness, vision disturbance
Activity	Whether movement or bending worsens the pain
Possible factors	Menstruation, lack of sleep, stress, exertion, a skipped meal
Medication	Name of the drug, dose and effect
Impact on functioning	Absence from work, interrupted activity, need to lie down

The diary helps to establish the frequency, duration, intensity, possible triggers and the number of medication days. It can also make it easier to judge how well treatment is working.

Bring a list of the medications and supplements you take, along with earlier test results, to the appointment. It is also worth considering whether similar headaches run in the family and whether their frequency is linked to the menstrual cycle.

What might the diagnostics look like?

The basis of diagnosis is a detailed history. The doctor may ask:

• when the first attacks appeared,
• how quickly the pain reaches maximum intensity,
• where it is located,
• how long it lasts,
• how often it occurs,
• what worsens or eases it,
• what symptoms accompany it,
• how many days a month medication is taken,
• whether the pain has changed recently,
• whether there was an injury, infection, pregnancy or another illness.

Next comes a general and neurological examination. Further tests may include blood tests, an eye examination, CT, MRI, vascular studies or other procedures matched to the suspected cause. Not everyone with a frequent headache needs the full set of tests. Just as with unexplained tiredness, symptoms are interpreted together with the whole clinical picture rather than in isolation.

What to watch out for when self-treating?

An as-needed painkiller may be an appropriate solution for occasional pain, but regularly reaching for more doses without a diagnosis is not a good long-term strategy.

It is especially important to:

• record the number of medication days,
• not combine several products containing the same substance,
• not increase doses on your own,
• consider contraindications related to gastrointestinal, kidney, liver, heart and circulatory conditions,
• consult about medication use in pregnancy and while breastfeeding,
• not use opioids as routine treatment for migraine or tension-type headache.

NICE does not recommend opioids for treating acute tension-type headache or migraine. It also stresses the need to inform patients about the risk of medication-overuse headache.

If you suspect pain caused by medication overuse, discuss how to stop the drugs with a doctor. Opioids and products whose sudden withdrawal may involve additional withdrawal symptoms require particular caution.

Summary

Frequent headaches are usually linked to migraine, tension-type headache or another primary disorder. This does not mean, however, that they should be dismissed.

A medical consultation is advisable when headaches return regularly, worsen quality of life, change their character or require increasingly frequent use of medication. New complaints after age 50, in pregnancy, after childbirth, after injury, and in people with cancer or a weakened immune system deserve particular attention.

Immediate care is needed above all for sudden, exceptionally severe pain, pain with new neurological disturbances, impaired consciousness, acute vision problems or a rapid deterioration in general condition.

Not every headache needs an MRI, but every new, unusual or worsening pattern deserves careful assessment.

Frequently asked questions

How many headaches a month is too many?

There is no single threshold that fits everyone. It is worth seeing a doctor once headaches regularly interfere with daily functioning or require frequent use of medication. Headache on at least 15 days a month for more than 3 months meets the criterion for chronic headache.

Can frequent headaches be a sign of a brain tumour?

A headache can occur in the course of intracranial disease, but on its own it cannot diagnose a tumour. What matters more are red flags such as worsening symptoms, new neurological signs, unexplained vomiting, impaired consciousness or a history of cancer. With typical migraine or tension-type headache and a normal neurological examination, routine imaging is usually not recommended.

Is a migraine always one-sided?

No. Migraine pain can be one-sided or bilateral. More characteristic are features such as throbbing, moderate or severe intensity, worsening with activity, nausea and sensitivity to light and sound.

How can you tell migraine aura from a stroke?

Typical aura develops gradually, lasts 5 to 60 minutes and fully resolves. Stroke symptoms more often appear suddenly, but telling these states apart on your own is not always possible. First-ever, sudden or unusual disturbances of speech, vision, sensation or muscle strength require urgent care.

Can painkillers make a headache worse?

Yes. Regular and frequent use of as-needed medication can lead to medication-overuse headache. The risk applies, among others, to using triptans, opioids or combination drugs on at least 10 days a month, and simple painkillers on at least 15 days a month for 3 months or longer.

Do you always need a CT or MRI for a headache?

No. Imaging is not routinely needed with a typical picture of migraine or tension-type headache, a normal neurological examination and no red flags. The doctor orders it when symptoms suggest a possible secondary cause of the pain.

Is a headache in pregnancy dangerous?

Typical tension-type and migraine headaches can still occur in pregnancy. However, a new, very severe or unusual headache, especially with vision disturbances, high blood pressure, marked swelling or feeling unwell, requires urgent consultation. Severe pain can be one of the symptoms of pre-eclampsia, which can also occur after childbirth.

References

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6. Royal College of Obstetricians and Gynaecologists. Pre-eclampsia. Patient information. Accessed July 2026.
7. National Institute for Health and Care Excellence. Migraine: management in adults. Clinical Knowledge Summaries. Updated guidance accessed July 2026.
8. Whitehead MT, Cardenas AM, Corey AS, et al. ACR Appropriateness Criteria® Headache. J Am Coll Radiol. 2019;16(11S):S364–S377. doi:10.1016/j.jacr.2019.05.030.
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This article is educational and does not replace a medical consultation. In the case of a sudden, exceptionally severe headache, new neurological disturbances, impaired consciousness or a rapid deterioration in health, seek medical help immediately.