The Buddha says life is suffering; both the ancient yogis and the Buddhists point to the kleshas as the causes of our suffering. These “afflictions” distort our mind and our perceptions effecting how we think, act and feel. The five main kleshas vary in intensity on our psyche, from being inconsequential in their effect to utter blindness. The kleshas not only create suffering, but are said to bind us to the endless cycle of birth and rebirth, and thus preventing us from achieving enlightenment.Avidya (ignorance) is the misconception of our true reality, believing that the temporary is eternal, the impure is the pure, and pleasure to be painful. This false representation of reality is the root klesha and produces the four others.
Go to the source for the rest: The Cause of Suffering: The Kleshas • Yoga Basics