Usog
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"Usog" is a Filipino superstition where an affliction or psychological disorder is attributed to an evil eye hex. It usually affects an unsuspecting child, usually an infant or toddler, who has been greeted by a stranger.
Once affected, the child begins to develop fever, and sometimes convulsions. Supposedly, the child can be cured by placing its clothing in hot water and boiling it. It is said that the condition is caused by the stranger having a masamang mata, or evil eye in Tagalog, lurking around. Superstitious folk say they have observed this phenomenon and regularly suggest this be added to the Psychiatric Disorders Handbook DSM-IV. The suggestion has not been accepted.
Usog can also affect adults, although it induces vomiting rather than fever. Supposedly, it can be prevented by stopping a stranger or visitor from greeting the child. Unlike "lihi", however, usog is not medically accepted.