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.
About contagion and contagiousness: Contagion and contagiousness refers to how easily the spread of Parainfluenza is possible from one person to another. Other words for contagion include infection, infectiousness, transmission or transmissability.Contagiousness has nothing to do with genetics or inheriting diseases from parents.t is not caused by a defective or abnormal gene. The contagious disease, Parainfluenza, can be transmitted: 1  from person to person by saliva, air, coughing, contact, surfaces, fecal-oral route, etc.