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According to the passage, a headache ---- .
Headache, like backache, is one of the
commonest types of pain with which mankind is
afflicted. It may arise under a diversity of
circumstances. A blow to the head causes pain,
and after a severe head injury with concussion,
headaches may continue for weeks or months.
The coverings of the brain, or meninges, are
sensitive structures and, when inflamed, as in
cases of meningitis, or irritated (as with meningeal
haemorrhage), headache may be a prominent
feature. The arteries of the brain are also sensitive,
and many kinds of headache are referable to
arterial disease, more especially to influences
which distend the lumen of the arteries, or which
distend and then contract the arterial walls. But the
brain itself is insensitive and lacerations or gunshot
wounds of the cerebral substance may
produce headache only in so far as the bony skull
and the meninges are at the same time damaged.
Tumours of the brain produce headache, not
because the brain tissue is involved, but because
the raised intracranial tension alters the diameter
of the intracranial arteries.