I've never heard someone say they've never heard a good case that emotions exist before. Would you mind elaborating? For me, I recognize emotione in myself that fit my understanding of the word "emotions", and that is sufficient for me to believe they exist

Many emotions have physiological "symptoms" and are associated with certain brain regions and pathways. Our understanding of biology does not permit us to define emotions to the level of physiological detail that we have for, say, inflammation, but that doesn't mean emotions don't exist