The term 'Feel the Pain' is a phrase that is often used to describe the experience of enduring physical or emotional pain. The crossword solutions for this term are SMART (5 letters), SUFFER (6 letters), ACHE (4 letters), and GRIEVE (6 letters). SMART is an acronym for 'Stimulus-Motivation-Action-Response Theory, ' which is a psychological theory that suggests that behavior is determined by the interaction between external stimuli and internal motivation. SUFFER is to experience pain, distress, or hardship. ACHE is a dull, continuous pain. GRIEVE is to feel deep sorrow or distress. Together, these words provide insight into the experience of feeling physical or emotional pain.