CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Headache. View of a man holding his head suffering from a headache or migraine. Headaches may occur due to stress, a hot or noisy environment, poor posture, long journeys or irregular meals. Headaches are also a symptom of a variety of medical conditions and can be caused by eating certain foods or drinking alcohol. The feeling of pain is due to tension or stretching in the membranes around the brain (meninges) and in the blood vessels and muscles of the scalp.
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