DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Headache. Computer-enhanced image of a woman holding her head in pain from a headache. Headaches are a very common form of pain, and are frequently brought on by stress, hunger or irregular sleep patterns. This could also represent a migraine, a very severe form of headache, often including nausea, vomiting and vision impairment. They are far more common in women, and are of unknown cause. They can last up to two days. Very rarely, a headache may be a sign of a severe disorder, including a brain tumour, meningitis and brain haemorrhage.
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