Criteria

International Classification of Diseases 11th revision (ICD-11): chronic pain[1]

Distinguishes the main categories of chronic primary pain and chronic secondary pain. Chronic pain is multifactorial: biologic, psychological, and social factors contribute to the pain syndrome.

The American College of Rheumatology 2010 criteria for the classification of fibromyalgia[38]

A patient satisfies diagnostic criteria for fibromyalgia if the following three conditions are met:

  • Widespread pain index (WPI) ≥7 and symptom severity (SS) scale score ≥5 or WPI 3 to 6 and SS scale score ≥9

  • Symptoms have been present at a similar level for at least 3 months

  • The patient does not have a disorder that would otherwise explain the pain.

International Classification of Headache Disorders-3 (ICHD-3)[2]

Headache disorders are typically divided into specific categories based on the ICHD-3. An abbreviated outline is provided below.

Primary headaches:

  • Migraine

  • Tension-type headache

  • Trigeminal autonomic cephalalgia (including cluster headache)

  • Other primary headache disorders.

Secondary headaches:

  • Headache from trauma or injury to the head and/or neck

  • Headache from cranial and/or cervical vascular disorder

  • Headache from nonvascular intracranial disorder

  • Headache from substance or its withdrawal

  • Headache from infection

  • Headache from disorder of homeostasis

  • Headache or facial pain from disorder of the cranium, neck, eyes, ears, nose, sinuses, teeth, mouth, or other facial or cervical structure

  • Headache from psychiatric disorder.

Painful cranial neuropathies, other facial pain, and other headaches:

  • Painful lesions of the cranial nerves and other facial pain

  • Other headache disorders.

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