 [ Symptoms ] is this a symptom of post nasal drip or something a little more serious  i spent the weekend at a relative is home and they have a cat i am allergic to cats so naturally my eyes were irritated i was sneezing and a bit congested after about a week the sneezing and congestion went away but i began to cough it started off as a dry cough but now after about two weeks it sounds pretty horrible and there is quite a bit of mucus is this a symptom of post nasal drip or something a little more serious [ Disease ] it sounds like you may have a condition called alopecia areata we do not know what causes it but this is typically a temporary condition and your hair will eventually grow back however corticosteroid injections can help the hair grow back you should see a dermatologist to make sure that is what is going on and to determine the right treatment