DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Headache. Digitised image of a woman holding her head due to a headache or migraine. The pain of a headache does not come from the brain itself, which lacks sensory nerves, but from the meninges around the brain and the blood vessels and muscles of the scalp. While most headaches have a simple cause, they are also caused by high blood pressure (hypertension) and brain tumours. Medical advice should be sought in cases of persistent headache.
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