Quick Answer
ICHD-3 is the international standard for classifying headache types. Accurate classification guides appropriate treatment and prevents misdiagnosis.
Medically reviewed by Dr. Jitendra Prasad Yadav • NMC 8029 • Kathmandu Neurology Clinic & Cognitive Center
ICHD-3 (International Classification of Headache Disorders, 3rd edition) is the internationally recognized framework for classifying headache disorders. Published by the International Headache Society, it provides standardized diagnostic criteria that neurologists worldwide use to distinguish between different types of headache —— ensuring consistent diagnosis and appropriate treatment.
Why classification matters: Without a systematic classification approach, headache is often treated generically as "just a headache." ICHD-3 distinguishes primary headaches (migraine, tension-type, cluster) from secondary headaches (caused by another condition such as infection, trauma, or vascular disease). This distinction directly changes management —— a migraine-specific approach differs fundamentally from managing tension-type headache, and missing a secondary cause can have serious consequences.
Dr. Jitendra Prasad Yadav — consultant neurologist & headache specialist at Kathmandu Neurology Clinic & Cognitive Center provides evidence-based evaluation for migraine.
ICHD-3 guides treatment in several ways. For migraine, the classification specifies whether aura is present, whether the headache is episodic or chronic, and which features (nausea, photophobia, phonophobia) meet criteria. This guides the choice between acute treatments (triptans, gepants, ditans), preventive options (beta-blockers, topiramate, monoclonal antibodies), and lifestyle interventions. For tension-type headache, the classification helps distinguish episodic from chronic forms and identifies medication-overuse contributors. For cluster headache, the strict criteria —— unilateral orbital pain, 15——180 minutes, autonomic features —— guide oxygen, triptans and preventive therapy.
Primary vs secondary headache: Primary headaches (migraine, tension-type, cluster) originate from the nervous system itself without an external cause. Secondary headaches result from another condition —— sinusitis, head trauma, vascular abnormalities, raised intracranial pressure, or systemic infection. ICHD-3 criteria help clinicians identify "red flags" that suggest secondary causes and warrant urgent investigation.
How Dr. Jitendra uses ICHD-3 in practice: At Kathmandu Neurology Clinic & Cognitive Center (Durbar Marg, Opposite of Yak & Yeti Hotel), Dr. Jitendra Prasad Yadav (NMC 8029) applies ICHD-3 classification at every headache consultation. The process begins with structured history —— onset, duration, severity, associated symptoms, frequency, triggers, and medication history. A headache diary reviewed over 4——8 weeks provides the pattern data that ICHD-3 criteria require. Classification is documented, treatment options are discussed transparently, and follow-up tracks diary-based improvement rather than relying on pain scores alone.
No scan replaces ICHD-3 classification. MRI and CT have roles when red flags are present, but the diagnosis of primary headache is clinical, not radiological. Bringing a headache diary, medication list, and prior reports to consultation helps the classification process.
This article is educational and does not replace individual medical advice.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
Migraine is a neurological condition; headache is one feature. Associated symptoms and functional impact are important for diagnosis.
Aura refers to visual, sensory, or speech symptoms that precede the headache in some people. Both types are migraine; the presence of aura may influence management discussion.
It is often manageable, but new or changing patterns should be evaluated to exclude secondary causes.
Tension-type headache involves multiple mechanisms, not solely muscle tightness. Relaxation, posture, and stress management may help, but it is not purely a muscular problem.
Migraine typically presents as moderate-severe throbbing headache with nausea and/or sensitivity to light or sound, worsened by routine activity. Duration 4–72 hours. Dr. Jitendra Prasad Yadav (NMC 8029) uses ICHD-3 criteria plus your headache diary (frequency, aura, medication days) and red-flag screen to distinguish …
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-09-04
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.