Thirst

The term Thirst is used to describe a vampire's hunger for blood, the supply of which must be replenished approximately once a month. A vampire, upon feeling the body's reaction to their waning blood supply, only has one to two weeks in which to feed before they are thrown into a blood lust, and the instincts take over to insure survival against starvation.

The onset of the Thirst is signified by a dryness of the mouth, shakes or tremblings in the body and even becoming distracted by the life essence of the humans in close proximity.