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A to Z of neurological topics

In this section we feature information on a number of tests, treatments and conditions, with links for more information either within this website or on external sites where possible. If you can't find what you're looking for, you may wish to speak with one of our Helpline team who may be able to answer your questions. Send an email to [email protected] or call free on 0808 808 1000.

  • H



    A type of tumour that can affect the head and neck and develops from the cells that line blood vessels.



    A collection of clotted blood that has formed outside of a blood vessel and which can put pressure on nearby structures. Haematomas can cause a wide range of symptoms depending on where they are located in the body.



    A large flow of blood that has escaped from a damaged blood vessel.


    See our Subarachnoid haemorrhage booklet

    Head injury


    See our Head injury booklet


    Useful links:

    The Silverlining Charity



    See our Headache booklet


    Useful links:

    OUCH (UK)

    The Migraine Trust

    Migraine Action

    Headache Expert

    Healthy lifestyle


    See our section on Health and lifestyle tips

    Hearing problems


    Useful links:

    Action on Hearing Loss



    A term that describes when a condition causes weakness or paralysis on only one side of the body.


    Useful links:


    Hereditary spastic paraplegia

    (also known as spastic paraeparesis)


    A group of inherited disorders that all primarily cause worsening weakness and stiffness in the leg muscles.

    Herniated disc


    The term herniated disc, also sometimes referred to as a slipped disc, describes when one of the discs of cartilage which sit between the vertebrae in the spine, is bulging or damaged and is causing pain or putting pressure on nearby nerves or the  spinal cord.

    Huntington's disease


    A progressive, inherited condition that causes damage to nerve cells in the brain and can affect a person’s movement, cognition and behaviour.


    Useful links:

    The Huntington’s Disease Association



    A build-up of fluid in the brain. The excess fluid leads to increased pressure on the brain which can cause damage to the brain tissue.


    See our Hydrocephalus and shunts fact sheet


    Useful links:


    SBH Scotland