On top of all your stats, there are several things that make this world dangerous. Some areas are considered dangerous due to these factors:
*health decreases over time or stays stagnant.
*extreme temperatures.
*large population of animals. Most animals can hurt you.
*staying under water for too long. You only have 75 seconds of air time, indicated by a glass noise. When you start hearing that sound every second, you are about to die.
*tall heights off the ground.
*long jumps from ledge to ledge.
*other tricky footing like small gaps or twisty narrow paths.
*natural disasters.
*nearby players if you have player kill (pk) enabled.