Should You Go to the ER or Wait for Your Doctor for a Severe Headache?

By Hanna SöderqvistUpdated Oct 06, 20267 min read

Sudden onset, fever with a stiff neck, or new trouble speaking or walking changes the answer fast — here is how to sort which door to walk through.

Table of contents

Where to Go, Based on Your Symptoms
How to Decide in the Moment
What to Say When You Call or Arrive
FAQ

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With a severe headache, the deciding factors are how fast the pain peaked, what came with it, and whether it is different from headaches you have had before. Those three things point to 911, an emergency room, urgent care, your primary care office, or a telehealth visit.

Use the table to match your symptoms to a venue, then the one-minute decision sequence below it if you are hurting right now and cannot read for long.

Where to Go, Based on Your Symptoms

Where to go	When it applies	Typical wait	What to expect there
Call 911	Pain reaches maximum intensity within about one minute (the American Migraine Foundation describes this as a thunderclap headache); the "worst headache of your life" (MedlinePlus, NIH/NLM, undated); headache with face drooping, arm weakness, speech trouble, sudden vision change or loss of balance — the B.E. F.A.S.T. stroke signs (American Stroke Association, undated); headache with confusion or loss of consciousness	Dispatcher answers in seconds and stays on the line	Crew checks blood pressure, blood sugar and neurological signs on the way; you are triaged on arrival rather than waiting in line
Emergency room (someone else drives)	Sudden, explosive headache (MedlinePlus, NIH/NLM, undated); severe headache with fever, stiff neck, nausea or vomiting not explained by another illness (NINDS/NIH, May 2025); headache after a head injury; first thunderclap headache (American Migraine Foundation, undated)	ACEP, citing CDC NHAMCS data in 2018, reported a median 18 minutes to see a provider and 68% seen within an hour; NCHS reported mean waits of 58.1 minutes in 2009, longer in urban EDs (62.4 minutes) than nonurban (40.0)	Triage first, then often imaging of the head, blood tests, and sometimes a spinal fluid test to look for bleeding or infection
Urgent care	Headache that matches your known migraine pattern, earache, sore throat or low-grade fever alongside it, with no sudden onset and no new neurological symptoms — MedlinePlus (NIH/NLM, undated) lists migraines and low-grade fevers as urgent care–appropriate	Usually under an hour, varies by clinic and time of day	Exam, vital signs, possibly fluids; they will send you to an ER if red flags turn up
Primary care office	Headache getting worse over 24 hours with no fever, stiff neck or neurological signs — MedlinePlus (NIH/NLM, undated) says contact a medical professional for this; headaches that are more frequent, waking you at night, or new for you over weeks	Same-day phone triage; appointment often within days	History, blood pressure, neurological exam, and a decision about imaging or a neurology referral
Telehealth	A headache you recognize, mild to moderate, steady or improving, no fever, no new weakness or vision change, and you mainly need advice on what to watch for	Minutes to a few hours	A clinician reviews symptoms by video or phone and tells you whether to stay home, go to urgent care, or go to an ER

If a worsening headache goes unassessed past that 24-hour mark, a cause that is treatable early — infection, raised pressure in the head, a blood pressure problem — has more time to progress, and symptoms such as confusion or neck stiffness may appear.

How to Decide in the Moment

Check the clock on the onset. If the pain went from nothing to its worst within about a minute, stop here and call 911 (American Migraine Foundation, undated; Harvard Health Publishing, undated).
Run B.E. F.A.S.T. in front of someone: stand with eyes closed, check whether vision has changed, smile, raise both arms, say a full sentence. Any drooping, weakness, slurring or new balance loss means call 911 (American Stroke Association, undated).
Feel for fever and try to touch your chin to your chest. Fever with a stiff neck, nausea and vomiting means an emergency room now (NINDS/NIH, May 2025).
Ask whether this is unlike any headache you have had before. "Worst headache of my life" or a headache unlike your usual pattern is an ER-level sign (MedlinePlus, NIH/NLM, undated).
If none of the above: has it been getting worse over 24 hours? Call your primary care office today. If it is steady and familiar, telehealth or urgent care is reasonable — and go to an ER if anything in steps 1–4 appears later.

What to Say When You Call or Arrive

Describe onset, peak, and what else changed. Leave the diagnosis to them.

Calling 911

Say this to the dispatcher
"I have a severe headache that started suddenly at about 2:15. It was at its worst within a minute. My right arm feels weak and my speech sounds slurred to my husband. I am 54, I take blood pressure medication, and I am conscious and sitting down. The address is…"

At emergency room triage

Say this to the triage nurse
"This headache started three hours ago, went from zero to the worst pain I have ever had in under a minute, and has not let up. I have a fever and I cannot bend my neck forward. I have never had a headache like this before."

Calling your primary care office

Say this to the scheduler or nurse line
"I have had a headache for two days and it has been getting worse over the last 24 hours. No fever, no weakness, no vision changes. It is different from my usual headaches. I need to be seen today or told where to go."

On a telehealth visit

Say this to the clinician
"Pain started gradually yesterday morning, about a 6 out of 10, same location and feel as my usual migraines. No fever, no numbness, no trouble speaking. I want to know what would mean I should go in."

A sudden severe headache can come from a ruptured blood vessel, but it can also come from a first severe migraine, a sinus infection or a blood pressure spike — which is exactly why it is examined rather than guessed at.

Frequently asked questions

Can an ER turn me away if I don't have insurance?

Under EMTALA, Medicare-participating hospitals with emergency departments must give a medical screening examination to anyone who comes in and asks for one, and they cannot delay that examination or stabilizing treatment to ask about insurance or payment method (American College of Emergency Physicians, undated). The protection applies regardless of ability to pay or immigration status (Connecticut General Assembly Office of Legislative Research, 2009). You may still receive a bill afterward, and hospitals often have financial assistance applications.

Will I wait for hours if I go in for a headache?

ACEP, citing CDC NHAMCS data in 2018, reported a median wait of 18 minutes to see a provider and 68% of patients seen within an hour. Waits vary by location — NCHS found mean waits of 62.4 minutes in urban EDs versus 40.0 minutes in nonurban ones in 2009. Symptoms like sudden onset or weakness move you up the triage line rather than down it.

What if urgent care sends me to the ER anyway?

That happens, and it is not a wasted trip — urgent care is built for things like migraines and low-grade fevers (MedlinePlus, NIH/NLM, undated), not for imaging the brain. If red flags appear during your visit, they will arrange transfer or tell you to go directly. If any thunderclap or stroke sign is present before you leave home, skip urgent care and call 911. This guide does not replace an in-person evaluation by a clinician.

Sources

MedlinePlus (NIH/NLM)Managing tension headaches at home: MedlinePlus Medical Encyclopedia
MedlinePlus (NIH/NLM)Tension headache: MedlinePlus Medical Encyclopedia

Written by

Hanna Söderqvist

Hanna writes about the quieter corners of mental health: boredom, loneliness, the ordinary weight of being tired. She approaches the subject with patience, resisting easy resolutions in favor of honest complication.