Waking up with a headache: causes, red flags and when to get it checked

A headache present on waking has a short list of typical causes, most of which relate to what happens during the night. Because blood pressure, breathing and carbon dioxide levels all shift in sleep, a disturbance in any of them can produce a dull, band-like or generalised headache that fades as the day gets going.

Roughly in order of how often they are found:

• Poor or insufficient sleep, and irregular bedtimes or oversleeping at weekends, which are a recognised trigger for tension-type headache and migraine.

• Obstructive sleep apnoea: loud snoring, witnessed pauses in breathing, unrefreshing sleep and daytime sleepiness alongside a dull morning headache.

• Medication-overuse headache: regular painkillers (including those with codeine) used on 10 to 15 or more days a month, so the headache returns as the dose wears off overnight.

• Caffeine withdrawal overnight, or alcohol the night before.

• Teeth grinding (bruxism) and jaw tension, with a sore jaw or temples on waking.

• Low mood, anxiety or insomnia, which commonly cause early waking with tension headache.

• Raised blood pressure, particularly very high readings, can contribute to morning headaches in some people.

• Raised pressure inside the skull from a mass, a blocked fluid pathway or idiopathic intracranial hypertension, which is rare but important.

Concern rises when the headache is new and progressive over weeks, wakes you from sleep, is worse on lying flat, coughing or straining, comes with vomiting, double vision, transient visual blackouts, a change in personality, or new weakness or seizures.

• Call 999: sudden severe headache, collapse, seizure, slurred speech, facial droop or limb weakness.

• Same-day GP or NHS 111: headache with fever and neck stiffness or a rash, or headache after a head injury.

• Prompt GP review (days): headache that is steadily worsening, wakes you at night, or causes blurred or double vision.

• Routine GP appointment: headaches on waking most days for several weeks, with snoring or tiredness.

The doctor will ask how many mornings a week the headache occurs, what time it eases, how much and what type of painkiller you take, caffeine and alcohol use, your sleep pattern, whether a partner has seen you stop breathing, and your mood. They will check blood pressure, look at the back of the eye for swelling of the optic disc, test eye movements and limbs, and consider your weight and neck size.

• Blood pressure measurement and, if high, ambulatory monitoring over 24 hours.

• Sleep study (home oximetry or polygraphy): to detect sleep apnoea when snoring and daytime sleepiness are present.

• Eye examination with retinal imaging: to look for optic disc swelling if raised pressure is suspected.

• MRI brain, sometimes with venography: reserved for red flags or when the examination is abnormal.

Keep a consistent sleep and wake time, limit caffeine after midday, and avoid alcohol close to bedtime. Cut back painkillers gradually and keep them to no more than two or three days a week; some people need medical help to stop medication-overuse headache because the headache temporarily worsens. A mouth guard can help if you grind your teeth.

The NHS route is a GP, then a sleep service or neurology as needed. Private sleep studies and neurology consultations are available without a GP referral, though an insurer may want one.