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  1. Cluster Headache: What It Is, Causes, Symptoms & Treatment

    Cluster headaches cause severe, one-sided head pain. These headaches usually last for at least 30 minutes and happen multiple times per day. They tend to follow a pattern, often showing up at the …

  2. Cluster headache - Symptoms and causes - Mayo Clinic

    Aug 12, 2025 · Common symptoms during a cluster headache include: Extreme sharp or stabbing pain, usually in, behind or around one eye. The pain can spread to other areas of the face, head and neck. …

  3. CLUSTER Definition & Meaning - Merriam-Webster

    The meaning of CLUSTER is a number of similar things that occur together. How to use cluster in a sentence.

  4. Cluster Headaches: Symptoms, Treatments, Causes vs Migraines

    Apr 25, 2017 · The headaches associated with clusters occur in groups. While the headaches themselves may be brief (as short as 15 minutes), the headaches can recur up to eight times in 24 …

  5. CLUSTER Definition & Meaning | Dictionary.com

    CLUSTER definition: a number of things of the same kind, growing or held together; a bunch. See examples of cluster used in a sentence.

  6. CLUSTER | definition in the Cambridge English Dictionary

    CLUSTER meaning: 1. a group of similar things that are close together, sometimes surrounding something: 2. a group…. Learn more.

  7. Cluster Definition & Meaning | YourDictionary

    Cluster definition: A group of the same or similar elements gathered or occurring closely together; a bunch.

  8. Cluster - definition of cluster by The Free Dictionary

    a. a chemical compound or molecule containing groups of metal atoms joined by metal-to-metal bonds b. the group of linked metal atoms present vb to gather or be gathered in clusters [Old English …

  9. CLUSTER definition and meaning | Collins English Dictionary

    A cluster of people or things is a small group of them close together. ...clusters of men in formal clothes.

  10. What is a cluster? - Princeton Research Computing

    The computational systems made available by Princeton Research Computing are, for the most part, clusters. Each computer in the cluster is called a node (the term "node" comes from graph theory), …