Do you feel an allergic reaction even when there is no visual? I am an eighth-grader at CMS. For my assignment, I designed and constructed a STREAM (Science, Technology, Research, Engineering, Art and Math) project to investigate the answer to this question. My results are that even if you do not see the allergen you may still get an allergic reaction. My solution to this is a device that you wear over your nose and it sort of filters the air that you breathe in.