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  2. The International Classification of Headache Disorders (ICHD) is a detailed hierarchical classification of all headache-related disorders published by the International Headache Society. [1]

  3. Migraine - Wikipedia

    en.wikipedia.org/wiki/Migraine

    Migraine (UK: / ˈ m iː ɡ r eɪ n /, US: / ˈ m aɪ-/) [1] [2] is a genetically-influenced complex neurological disorder characterized by episodes of moderate-to-severe headache, most often unilateral and generally associated with nausea and light and sound sensitivity.

  4. Blood–brain barrier - Wikipedia

    en.wikipedia.org/wiki/Blood–brain_barrier

    The blood–brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that regulates the transfer of solutes and chemicals between the circulatory system and the central nervous system, thus protecting the brain from harmful or unwanted substances in the blood. [1]

  5. Circulatory system - Wikipedia

    en.wikipedia.org/wiki/Circulatory_system

    In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).

  6. Chronic kidney disease - Wikipedia

    en.wikipedia.org/wiki/Chronic_kidney_disease

    Chronic kidney disease (CKD) is a type of long-term kidney disease, in which either there is a gradual loss of kidney function which occurs over a period of months to years, or an abnormal kidney structure (with normal function).

  7. Keening - Wikipedia

    en.wikipedia.org/wiki/Keening

    A woman keening at a wake in County Kerry in the early nineteenth century, depicted from the memories of Samuel Carter Hall.She had "black, uncombed locks" and a blue cloak, and held her hands above the body then dramatically waved them in the air "as if by sudden inspiration".

  8. Kenning - Wikipedia

    en.wikipedia.org/wiki/Kenning

    Detail of the Old English manuscript of the poem Beowulf, showing the words ofer hron rade (' over the whale's road '), meaning ' over the sea '.. A kenning (Icelandic: [cʰɛnːiŋk]) is a figure of speech, a figuratively-phrased compound term that is used in place of a simple single-word noun.

  9. Chest pain - Wikipedia

    en.wikipedia.org/wiki/Chest_pain

    Chest pain is pain or discomfort in the chest, typically the front of the chest. [1] It may be described as sharp, dull, pressure, heaviness or squeezing. [3] Associated symptoms may include pain in the shoulder, arm, upper abdomen, or jaw, along with nausea, sweating, or shortness of breath.