The term "Big Issue" refers to a significant problem or challenge that requires attention, action and resolution. It is often used in reference to social, economic, political or environmental issues that have far-reaching consequences and impact on society as a whole. The expression can also refer to a major concern for an individual, group or organization, which demands their full focus and effort towards finding a solution. In essence, the phrase conveys the idea of something being important enough to warrant attention and action from those affected by it.