Sneezing  mean I am sick?
Not necessarily. Indeed, sneezing is one of the symptoms of 
respiratory disease, but can also be caused by irritants. Sneezing role 
is to eliminate “intruders” in the airways so best known guilty of 
appearance sneezing is the dust. Other culprits: pepper, cold air, and 
surprisingly light, pollen, animal dander,toxic gases, smoke, and 
others.
When I am sick?
Infections, especially viral, have the 
same symptoms. Nasal mucosa is inflamed, irritated and the body tries to
 eliminate the “intruder” by sneezing.
Sneezing walk disease
The speed at which air is removed during a sneeze is at least 160 
kilometers per hour. So viruses are spread in all directions at 
breakneck speed.