One of the prominent contemporary poets of Iran, who compiled creativity and originality along with research and survey, and was indeed taken seriously by both the literary associations and the academic personalities during his lifetime, was the late Qeysar Aminpoor. Works such as All Flowers are Sunflowers, Sudden Mirrors, etc along with his last poetry book entitled as The Grammatical Structure of Love; prove the high value of his works; while one can discuss the significance of his works from a variety of perspectives and approaches. The researcher dares say that after studying Aminpoors' poetry collections and books, he realized that Aminpoor was as a matter of fact one of the greatest poets of the last three decades concerned about human and its related concepts including the pain and suffering a man goes through. He was actually involved with these issues in his artistic life and social life as a reality and concept. In this article the author initially surveys the diverse dimensions of this issue as related to the essence and concept of pain and suffering which ruled over Aminpoor's thoughts and language. Then the collection of his poetry is surveyed and analyzed within four categories; conceptual, existential, teleology, and the moral statue of pain and suffering.