Semantically are different things. A problem is a doubt and a need is driven feeling. Both things can cross in a situation but isn't apply 100% of the times. Si

Semantically are different things. A problem is a doubt and a need is driven feeling. Both things can cross in a situation but isn't apply 100% of the times. Since both need and problems can be subjective, the idea is to trigger the need instead of finding posible problems to solve. As the rule #1 say: not everyone has a problem, but you can create a need in everyone.