Excessive eagerness to please others
This is often caused by wanting affection from others. This is often because the person did not get affection from their mother when they were a child.
This can cause a person to do things for others to get affection from them, even of the things being asked of them are not right. This is because they want the affection from the other person.
Their endless craving to get this can make them work so hard they get exhaustion and so on.