“…Impact of sex hormones on the nasal mucosa has been shown by previous researchers in various physiological, iatrogenic or pathological conditions. 3 , 5 , 6 , 7 , 13 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 Almost all concluded that E2 and PG causes obstruction and edema in the nasal cavity which is the case in this study ( Fig. 2 b).…”