Cysts can arise through a variety of processes in the body, including.  1 wear and tear or simple obstructions to the flow of fluid, 2  infections, 3  tumors, 4  chronic inflammatory conditions, 5  genetic (inherited) conditions,  defects in developing organs in the embryo.
1 Acute * sinusitis often develops after a person has had a cold, with symptoms lasting less than 3 weeks. 2  Chronic * sinusitis can last 3 to 8 weeks or longer; it often occurs in people who have allergies or asthma. 3  Recurrent sinusitis consists of several acute episodes of sinusitis in 1 year.
1 Someone with the flu is contagious for a day or so before symptoms start, then remains contagious for 5 to 7 days once they appear. 2  The CDC considers someone to be contagious until the fever is back to normal, without the help of medication, for 24 to 48 hours.hen you have a contagious illness, like the flu or a cold, the sore throat is often accompanied by a runny nose. 1  The sore throat is sometimes caused by postnasal drip, as fluids from your sinuses drip down the back of your throat, causing redness and irritation. 2  The throat feels raw, irritated, and painful.