Headache
Also known as: Headache, not elsewhere classified
General information only. Anpheros does not diagnose and does not recommend treatment. Talk to a doctor or pharmacist about your situation. In an emergency, call 112 (or your local emergency number).
In short
Headache is the most common form of pain, with tension headaches being the most common type. Other common types of headaches include migraines, cluster headaches, and sinus headaches. A sudden, severe headache with no known cause can be a sign of a stroke, which requires calling 112 in Europe or 9-1-1 in the United States right away. Medical help is required right away if a headache occurs after a blow to the head, or along with a stiff neck, fever, confusion, loss of consciousness, or pain in the eye or ear. Headache is listed by the cited source as a related topic of migraine.
Source: MedlinePlus, National Library of Medicine. · Source: CDC. Available free at https://www.cdc.gov/stroke/signs-symptoms/index.html. Use does not imply endorsement by CDC or HHS. · Source: MedlinePlus, National Library of Medicine.
AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.
Codes
- ICD-10
- R51
- ICD-11
- MB4D Headache, not elsewhere classified
Description
Almost everyone has had a headache. Headache is the most common form of pain. It's a major reason people miss days at work or school or visit the doctor.
The most common type of headache is a tension headache. Tension headaches are due to tight muscles in your shoulders, neck, scalp and jaw. They are often related to stress, depression or anxiety. You are more likely to get tension headaches if you work too much, don't get enough sleep, miss meals, or use alcohol.
Other common types of headaches include migraines, cluster headaches, and sinus headaches. Most people can feel much better by making lifestyle changes, learning ways to relax and taking pain relievers.
Not all headaches require a doctor's attention. But sometimes headaches warn of a more serious disorder. Let your health care provider know if you have sudden, severe headaches. Get medical help right away if you have a headache after a blow to your head, or if you have a headache along with a stiff neck, fever, confusion, loss of consciousness, or pain in the eye or ear.
NIH: National Institute of Neurological Disorders and Stroke
When to get help
In an emergency, call 112 (or your local emergency number).
What are the signs of stroke in men and women?
- Sudden severe headache with no known cause.
Call 9-1-1 right away if you or someone else has any of these symptoms.
Quoted word for word from the cited source and checked against it; not reviewed by a clinician. Not a diagnosis. 9-1-1 is the US emergency number: in Europe call 112.
Centers for Disease Control and Prevention (CDC) — Signs and Symptoms of Stroke
Related terms in the cited sources
May be associated with
- Migraine Condition
In alphabetical order.
Next to it in ICD-10
- R49.2Too much or too little nasal sound in the voice
- R50Fever
- R50.2Fever caused by a medicine
- R52Pain
- R52.0Acute pain
- R52.1Chronic pain that does not respond to treatment
Neighbouring codes in the classification, not a medical link.
What people report
Not enough data yet. Anonymous counts appear here only for groups of at least 20 people who agreed to share them.
External resources
Questions
What is the ICD-10 code for Headache?
R51 (WHO, International Classification of Diseases, 10th Revision).
What is the ICD-11 code for Headache?
MB4D: Headache, not elsewhere classified (WHO, ICD-11 for Mortality and Morbidity Statistics).
Sources and attribution
- Source: MedlinePlus, National Library of Medicine.
- ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).
- ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
- Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
- Source: CDC. Available free at https://www.cdc.gov/stroke/signs-symptoms/index.html. Use does not imply endorsement by CDC or HHS.
Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →
About this page. This page brings together public information from official sources, each cited where it is used. It is not medical advice, it is not a diagnosis, and it does not tell you which treatment to take.
Treatments. Indications are quoted unchanged from official product information (European Medicines Agency, U.S. Food and Drug Administration). They describe what a medicine is approved for, not whether it is right for you. Approved uses can differ between countries. Always read the package leaflet and follow your doctor's or pharmacist's advice.
What people report. Figures marked "reported by Anpheros users" are anonymous counts from at least 20 people who agreed to share them. They show what people report, not what works, and they are not clinical evidence.
Links between terms. "May be associated with" means the link appears in a cited source. It does not mean you have that condition.
In an emergency, call 112 (or your local emergency number). Do not delay seeking medical help because of something you read here.