Max health and current health are visible above units and structures, excluding the spawn tower, as a green bar, or a red bar if it is an enemy structure. When the bar is displayed above a champion's model, it is segmented into bars where each bar represents ~100 health. A black line is used to break sections of 1000 health.
Related ThreadsHealth Potions? - last post by @ Jul 10, 2008
Health Problems - last post by @ Jan 8, 2012
Health problems but not diseased!!! HELP!! - last post by @ Sep 5, 2007
Damage Health v. Drain Health - last post by @ Jun 8, 2006
Lost magicka, health, and stamina when defeating Alduin - last post by @ Mar 16, 2014