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Revision as of 23:17, 16 February 2009

Headache
ICD-10 R51
ICD-9 784.0

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Please Join in Editing This Page and Apply to be an Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [3] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.

A headache (cephalgia in medical terminology) is a condition of pain in the head; sometimes neck or upper back pain may also be interpreted as a headache. It ranks amongst the most common local pain complaints.

The vast majority of headaches are benign and self-limiting. Common causes are tension, migraine, eye strain, dehydration, low blood sugar, and sinusitis. Much rarer are headaches due to life-threatening conditions such as meningitis, encephalitis, cerebral aneurysms, extremely high blood pressure, and brain tumors. When the headache occurs in conjunction with a head injury the cause is usually quite evident. A large percentage of headaches among females are caused by ever-fluctuating estrogen during menstrual years. This can occur prior to, during or even midcycle menstruation.

Treatment of uncomplicated headache is usually symptomatic with over-the-counter painkillers such as aspirin, paracetamol (acetaminophen), or ibuprofen, although some specific forms of headaches (e.g., migraines) may demand other, more suitable treatment. It may be possible to relate the occurrence of a headache to other particular triggers (such as stress or particular foods), which can then be avoided.

Pathophysiology

The brain in itself is not sensitive to pain, because it lacks pain-sensitive nerve fibers. Several areas of the head can hurt, including a network of nerves which extend over the scalp and certain nerves in the face, mouth, and throat. The meninges and the blood vessels do have pain perception. Headaches often result from traction to or irritation of the meninges and blood vessels. The muscles of the head may similarly be sensitive to pain.

Types

There are five types of headache: vascular, myogenic (muscle tension), cervicogenic, traction, and inflammatory.

Vascular

The most common type of vascular headache is migraine. Migraine headaches are usually characterized by severe pain on one or both sides of the head, an upset stomach, and, for some people, disturbed vision. It is more common in women. While vascular changes are evident during a migraine, the cause of the headache is neurologic, not vascular. After migraine, the most common type of vascular headache is the "toxic" headache produced by fever.

Other kinds of vascular headaches include cluster headaches, which cause repeated episodes of intense pain, and headaches resulting from high blood pressure (rare).

Muscular/myogenic

Muscular (or myogenic) headaches appear to involve the tightening or tensing of facial and neck muscles; they may radiate to the forehead. Tension headache is the most common form of myogenic headache.

Cervicogenic

Cervicogenic headaches originate from disorders of the neck, including the anatomical structures innervated by the cervical roots C1–C3. Cervical headache is often precipitated by neck movement and/or sustained awkward head positioning. It is often accompanied by restricted cervical range of motion, ipsilateral neck, shoulder, or arm pain of a rather vague non-radicular nature or, occasionally, arm pain of a radicular nature.

Traction/inflammatory

Traction and inflammatory headaches are symptoms of other disorders, ranging from stroke to sinus infection.

Specific types of headaches include:

A headache may also be a symptom of sinusitis.

Like other types of pain, headaches can serve as warning signals of more serious disorders. This is particularly true for headaches caused by inflammation, including those related to meningitis as well as those resulting from diseases of the sinuses, spine, neck, ears, and teeth.

Diagnosis

While, statistically, headaches are most likely to be harmless and self-limiting, some specific headache syndromes may demand specific treatment or may be warning signals of more serious disorders. Some headache subtypes are characterized by a specific pattern of symptoms, and no further testing may be necessary, while others may prompt further diagnostic tests.

Headache associated with specific symptoms may warrant urgent medical attention, particularly sudden, severe headache or sudden headache associated with a stiff neck; headaches associated with fever, convulsions or accompanied by confusion or loss of consciousness; headaches following a blow to the head, or associated with pain in the eye or ear; persistent headache in a person with no previous history of headaches; and recurring headache in children.

The most important step in diagnosing a headache is for the physician to take a careful history and to examine the patient. In the majority of cases the diagnosis will be tension headache or migraine, both of which can be managed on the basis of a clear-cut clinical picture. Where doubt remains, or if there are abnormalities detected on examination, further investigations are justified.[1] Computed tomography (CT/CAT) scans of the brain or sinuses are commonly performed, or magnetic resonance imaging (MRI) in specific settings. Blood tests may help narrow down the differential diagnosis, but are rarely confirmatory of specific headache forms.

Complete Differential Diagnosis of Causes of Headache

Causes include [2] [3]

Cardiac HypotensionHypertensionMalignant hypertension
Chemical / Poisoning Amnesic shellfish poisoningAnadenanthera peregrinaAntimonyArsenic poisoningArtemisia afraCarbon monoxideCopperCyanideHeavy metal ingestionHemlockHydrogen sulfideLead poisoningManganeseMarine toxinsMonocrotophosNicotine poisoningRadiation poisoningSoil contaminationThalliumToxic headacheWater intoxication
Dermatologic Linear immunoglobulin A dermatosis
Drug Side Effect AcamprosateAcyclovirAlatrofloxacin InjectionAlosetronAmantadineAmbrisentanAminophyllineAmiodaroneAmlodipineAmphotericin BAnagrelideArmodafinilAtorvastatinBenazeprilBepridilBexaroteneBisoprololBosentanBromocriptineButabarbitalButorphanolCabergolineCaffeineCandesartanCapecitabineCarbamazepineCarbimazoleCarmustineCarteololCarvedilolCaspofunginCilansetronCilostazolClomethiazoleCombined oral contraceptive pillCycloserineCyclosporinCefaclorCefamandole Nafate InjectionCefotetanCefdinirCefoperazone Sodium InjectionCalcitriolChelation therapyChlorothiazideChlorthalidoneCilostazolCimetidineClopidogrelCyclosporine InjectionDeferasiroxDexamfetamineDigoxinDiltiazemDimercaprolDinoprostoneDipivefrineDipyridamoleDisopyramideDocosanolDolasetronDofetilideDoxazosinEnalaprilEpinephrineEplerenoneEpoprostenolErgotamineEtanercept InjectionEthacrynic AcidEthanolEthosuximideEzetimibeFelodipineFenofibrateFenoldopamFlu vaccineFluorouracilFluoxetineFluvastatinEpinephrineFosinoprilFurosemideGanciclovirGemeprostGlyceryl trinitrateGranisetronGriseofulvinGyromitrinIndomethacinInsulin lisproInfluenza vaccineImatinib mesylateInterleukin 2Isosorbide dinitrateIsosorbide mononitrate • Lerisetron • LevosimendanLofepramineLomotilLisurideMefloquine MemantineMethimazoleMetronidazoleMethyprylonModafinilMonosodium glutamateMoricizineNicorandilNifedipineNitrendipineNitroglycerineNon-steroidal anti-inflammatory drugsOxtriphyllineOxytocin injectionOmalizumabOndansetronPalonosetron • Pemirolast • PergolidePimecrolimusPiribedilPropylthiouracilQuinidineQuinineRasagiline • Reproterol • RoflumilastRopiniroleSalbutamolSelective serotonin reuptake inhibitorSildenafilSodium nitrite • Sulprostone • TadalafilTrabectedinTrimeprazineTrimethobenzamide • Tribavirin • TrimethadioneTropisetronVardenafilVitamin AZafirlukastZileutonZomepirac
Ear Nose Throat Angina tonsillarisNasal polypOtitis externaOtitis mediaPharyngitisRhinolithPeritonsillar abscessStrep throatSinusitisTrochleitisTonsillitisUpper respiratory tract infection
Endocrine AcromegalyAddison's diseaseConn syndromeDiabetes mellitusHypoglycemiaHyperaldosteronismHyperparathyroidismHyperpituitarismInsulinomaMenopausePituitary tumour (growth hormone secreting) • Polycystic Ovarian Syndrome
Environmental Conditions AirsicknessAltitude sicknessBrain freezeDiesel particulate matterHeat stroke • Ice cream headache • Multiple chemical sensitivitySecond-hand smoke
Gastroenterologic Crohn's diseaseInflammatory Bowel Disease
Genetic • No underlying causes •
Hematologic AnemiaBlood transfusionLeukemiaMultiple myeloma
Infectious Disease Acute Disseminated EncephalomyelitisAcute viral nasopharyngitis (common cold)AdenoiditisAIDSAlkhurma virusAnaplasmosisAseptic meningitisAspergillus clavatusAstrovirusBlastomycosisBolivian hemorrhagic feverByssinosisBrucellosisBruxismBoutonneuse feverCampylobacteriosisCalifornia encephalitis virusChagas diseaseChikungunyaCladosporiumCotton feverCoxsackie BCryptococcosisCysticercosisDengue fever • Dental infection • EbolaEncephalitisFeverFeverfewFreshers' FluGiardia lambliaGlioblastoma multiformeGradenigo's syndromeGroup A streptococcal infectionHaemophilus influenzae serotype B infectionHangoverHantavirusHay feverHarvest miteHenipavirusHerpes zosterHepatitisHerpesviridaeHIVJapanese encephalitis[ • Hymenolepis infectionInfluenza • Intracranial abscess / granuloma • Lábrea feverLegionellosisLeptospirosisListeriosisLyme diseaseMalariaMarburg virusMansonelliasisMeningococcemiaMeningoencephalitisMetabolic acidosisMetal fume feverMononucleosisMicropolyspora faeniMonkeypox virusMucormycosisMumpsMycoplasma pneumoniaeNaegleria fowleriNaegleria infectionNeisseria meningitidisNipah virus encephalitisNocardiosisNorovirusOropouche feverPityriasis roseaPsittacosisQ feverRamsay Hunt syndromesRat-bite feverRelapsing feverRhinovirusRickettsial infectionsRift valley feverRoss River FeverRocky Mountain spotted feverRubellaSaccharopolyspora rectivirgulaSnakebiteScarlet feverScrumpoxShinglesSiraitia grosvenoriiSitophilus granariusSodokuSt. Louis encephalitisStaphylococcal enteritisStreptobacillusSyphilisThermoactinomyces sacchariThermoactinomyces vulgarisTrench feverTrichinosisTuberculous meningitisTularemiaTyphoid feverViral GastroenteritisViral Hepatitis CWest Nile VirusYellow feverYersinia Pestis InfectionZika fever
Musculoskeletal / Ortho Cervical spondylosisTemporomandibular joint disorder
Neurologic Acoustic neuromaApoplexyArachnoid cystArcuate foramenAcute disseminated encephalomyelitisArnold nerve cough syndromeEpilepsyIdiopathic intracranial hypertensionMultiple sclerosisPituitary apoplexyPosterior cervical sympathetic syndromePosterior leucoencephalopathy syndromeRaised intracranial pressureSpinal autonomic dysreflexiaWest syndrome
Nutritional / Metabolic Thiamine (Vitamin B1) deficiency
Obstetrics & Gynecology EclampsiaPre-eclampsiaPregnancyPremenstrual syndrome
Oncologic Acoustic neuromaAdrenal carcinomaAdrenal tumorAstrocytomaAtypical Teratoid Rhabdoid TumorBrain tumorBrain Stem GliomasCarcinoid tumours and carcinoid syndromeCraniopharyngiomaEpendymomaGliomatosis cerebriMedulloblastomaMeningiomaOligoastrocytomaPhaeochromocytomaPolycythaemia rubra veraSubdural hygromaTongue cancer
Opthalmologic Acute posterior multifocal placoid pigment epitheliopathyAneisokoniaAsthenopiaComputer vision syndromeOcular NeurosisOculogyric crisisProgressive lenses
Overdose / Toxicity Acute alcohol intoxicationAlcohol withdrawalAlcoholismMedication overuse
Psychiatric Anxiety disorder • Functional disorders • Primary affective disorder • Chronic stressClinical depressionWorkplace stressGulf War syndrome
Pulmonary Acute bronchitisBird breeder's lungBird fancier's lungCheese worker's lungChemical worker's lungCoughCommunity-acquired pneumoniaGrain handler's lungHot tub lungHumidifier lungHypersensitivity pneumonitisLower respiratory tract infectionMalt worker's lungNylon worker's lungObesity hypoventilation syndromePaprika splitter's lung
Renal / Electrolyte Diabetic nephropathyHypercalcemiaHyponatremia
Rheum / Auto Immune / Allergy Antiphospholipid syndromePolymyalgia rheumaticaSystemic lupus erythematosusTakayasu arteritisTemporal arteritisWegener's granulomatosis
Trauma Cervical spine trauma • Dental trauma •
Vascular Diseases & Malformations Arteriovenous malformationBerry aneurysmCarotid artery dissectionCavernous angiomaCavernous Sinus ThrombosisCerebral venous sinus thrombosis • Cerebellar infarction • Cerebral aneurysmCerebral arteriovenous malformationCerebrovascular accidentCerebrovascular diseaseEpidural hematoma • Intracranial haemorrhage • Migraine • Posterior communicating artery aneurysm • Subarachnoid haemorrhageSuperior vena cava syndromeVascular headache • Vertebral artery dissection • Vertebro-basilar artery syndrome •
Miscellaneous Agastache rugosaBearberryCluster headacheColloid cyst of third ventricleHepatic failureIntracranial space-occupying lesionParoxysmal hemicrania, chronicParry-Romberg syndromeReversible posterior leukoencephalopathy syndromeSpontaneous intracranial hypotensionStanding (position)Thunderclap headache

Treatment

Not all headaches require medical attention, and respond with simple analgesia (painkillers) such as paracetamol/acetaminophen or members of the NSAID class (such as aspirin/acetylsalicylic acid or ibuprofen).

In recurrent unexplained headaches, healthcare professionals may recommend keeping a "headache diary] with entries on type of headache, associated symptoms, precipitating and aggravating factors. This may reveal specific patterns, such as an association with medication, menstruation or absenteeism or with certain foods. It was reported in March 2007 by two separate teams of researchers that stimulating the brain with implanted electrodes appears to help ease the pain of cluster headaches.[4]

Prevention

Some forms of headache, such as migraine, may be amenable to preventative treatment. On the whole, long-term use of painkillers is discouraged as this may lead to "rebound headaches" on withdrawal. Caffeine, a vasoconstrictor, is sometimes prescribed or recommended as a remedy or supplement to pain killers in the case of extreme migraine. This has led to the development of paracetamol/caffeine analgesic. One popular herbal preventive treatment for migraines is Feverfew. Magnesium, Vitamin B2, and Coenzyme Q10 are "natural" supplements that have shown some efficacy for migraine prevention(5).[5]

Manipulative therapy

A controversial approach to headache treatment is chiropractic care. Most research supporting the chiropractic adjustment (also known as spinal manipulation by the scientific community) has been self-funded by the chiropractic profession.

The most compelling study of chiropractic efficacy is Nelson's randomized trial, comparing chiropractic to medical care,[6] which included the drug amitriptyline, for the treatment of Migraine Headache. During the 4-week trial, both groups reduced in symptoms. After withdrawal of treatment, the medical group relapsed or got worse, whereas the group receiving chiropractic care maintained their improvements. The amitriptyline is more cost-effective as it is cheaper than the cost of visiting a doctor, but freedom from symptoms or a reduction in frequency only happened in the chiropractic group.

Independent (non-chiropractic) researchers reviewed research on many different types of behavioral and physical treatments for tension-type and cervicogenic headaches[7] and found that cervical spinal manipulation was associated with improvement in cervicogenic headache outcomes (but not for tension-type headache), and was superior to soft-tissue therapies like massage.

References

  1. Detsky ME, McDonald DR, Baerlocher MO, Tomlinson GA, McCrory DC, Booth CM. Does this patient with headache have a migraine or need neuroimaging? JAMA 2006;296:1274-83
  2. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:77 ISBN 1591032016
  3. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:68 ISBN 140510368X
  4. Brain Stimulation May Ease Headaches. Reuters, March 9, 2007.
  5. Mauskop A. Alternative therapies in headache: Is there a role? Med Clin North Am 2001;85(4):1077-1084. PMID 11480259.
  6. "The Efficacy of Spinal Manipulation, Amitriptyline and the Combination of Both Therapies for the Prophylaxis of Migraine Headache." J Manipulative Physiol Ther 1998; 21 (8) Oct: 511–519.
  7. "Evidence Report: Behavioral and Physical Treatments for Tension-type and Cervicogenic Headache." Duke University Evidence-based Practice Center, Center for Clinical Health Policy Research.

External links

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