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Particularly, that form of cephalalgia called sick headache is apt to appear, in the periodical form, through several generations.

Poisoning is manifested by weakness, cephalalgia, vomiting, pallor, general anemia, lassitude, and local paralysis.

Published in the journal Headache, their study compared the number of "cephalalgia attacks" -- headaches of all kinds -- experienced by 201 male professional divers and a control group of healthy men who didn't dive.

These were pavor nocturnus, sudden sweats, heat, neuralgia, sialorrhea, periodical cephalalgia and, above all, vertigo; and these symptoms were not always accompanied by unconsciousness nor followed by coma.

In the summer of 1873 had a very severe attack of cephalalgia, which, judging from his subsequent history, was probably of rheumatic origin.