Internal Problem
An inner or internal problem is the chance for change.
While the external problem shows the audience the character’s motivation to act (he or she wants to solve the problem), it is the internal problem that gives the character depth.
In storytelling, the internal problem is a character’s weakness, flaw, lack, shortcoming, failure, dysfunction, error, miscalculation, unresolved issue, or mistake. It is often manifested to the audience through a negative character trait. Classically, this flaw may be one of excess, such as too much pride. Almost always, the internal problem involves egoism. By overcoming it, the character will be wiser at the end of the story than at the beginning. Thus the character must learn cooperative behaviour in order to be a mature, socially functioning person.

The inner problem is the pre-condition for the character’s transformation. It is the flaw, weakness, mistake, error, or deficit that needs to be fixed. In other words, it shows what the character needs to learn.
Internal problems may be character traits that cause harm or hurt to others. They cause anti-social behaviour. And internal problems can also harm the character. They can be detrimental to his or her solving the external problem.
From Lack of Awareness to Revelation
While the external problem provides a character’s want, i.e. motivation, the internal problem provides the need.
The audience sees the flaw before the character does. The character is blinkered, has a blind spot. She first has to learn to see what the audience already knows. (more…)
