There are three types of problems that people tend to face in their lives: external, internal, and existential. External problems involve something outside our control, such as an illness, natural disaster, or even family conflicts. Internal issues result from poor choices and decisions in life, such as not exercising enough or eating processed food. Existential problems are more complicated than the other two types because they require facing an unknown. This is why people must do things like research and experiment with different solutions to solve them.