Therefore, the common symptoms that are most frequently observed are excessive sneezing, choked or runny nose, itching in the eyes, nose, and throat, tears in the eyes, etc. There are some other symptoms that are less common, like conjunctivitis or pink eye (a condition where the membranes of eyelids swell up reddening the eyes), allergic shiners (formation of dark circles under the eyes due to restriction of blood flow in the sinus area), headache, difficulty in concentration, sleeping problems, etc.