They are roundly-shped shrines on the ground that emit green light. When the player stands near them, they gradually refill the Health Bar. However, the healing power of these shrines is not infinite - they dry up after a while. A dried up Health Shrine does not emit green light.
The Health Shrines are not as common as the Large Medipacks are.
- In-game description on the info text, "Health Shrine Discovered", that appears when finding the first Health Shrine