WoW API: UnitHealth

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Returns the current health of the specified unit.

local health = UnitHealth(unit);

Parameters

unit 

UnitId - identifies the unit to query health for

Returns

health 

Integer - current health of the specified unit, returns 0 if the specified unit does not exist (eg. "target" given but there is no target)

Example

Print the target's health to the chat frame:

DEFAULT_CHAT_FRAME:AddMessage( "target health ="..UnitHealth("target") )