Search results for NHS UK. Headaches: Types, causes, and when to seek medical help. National Health Service.

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• Where to get the vaginal ring

  The vaginal ring is available from sexual health clinics, some GP surgeries and young people's services.

• Causes of non-melanoma skin cancer

  Find out what causes non-melanoma skin cancer and what the risk factors are.

• Causes of chronic lymphocytic leukaemia

  Find out about who may be more likely to get chronic lymphocytic leukaemia.

• Overview - Psychosis

  Read about psychosis, a mental health problem that causes people to perceive or interpret things differently from those around them.

• Snake bites

  Find out about what to do if you or someone you know are bitten by a snake.

• Encephalitis - Causes

  Find out about the main causes of encephalitis, including viral infections and problems with the immune system.

• Brain abscess - Causes

  Read about the causes of a brain abscess, including infections or severe head injuries leading to bacteria or fungi entering the brain tissue.

• Trigeminal neuralgia - Causes

  Read about the causes of trigeminal neuralgia.

• Cardiovascular disease

  Find out about cardiovascular disease (CVD), including the main types, what causes it and how you can reduce your risk of getting it.

• How to find local mental health services

  Local mental health services for adults come from various providers and you can choose who to contact in your area to get help.