There is no definite scientific answer to why most people sneeze two or three times in one go. However, people who sneeze more than three times most likely have special immunological or neurological characteristics. For instance, they may have allergies, notes Scienceline.

Sneezing happens when something irritates the nose or throat’s mucous membranes. Sneezing helps humans eject harmful substances from their noses and mouths. Some people are genetically predisposed to sneeze at the sight of a bright light. This condition is called the photic sneeze reflex. Snatiation is a term for sneezing after a heavy meal.

The most common cause for people to sneeze is catching a cold or being ill with a flu. People with allergies sneeze to expel dust, pollen, mold and animal dander. Certain nose sprays, which contain corticosteroids, can also cause sneezing. Polluted air, spicy foods and strong emotions can bring on a sneezing fit, as can drug withdrawal.

The process of sneezing engages many muscle groups from the abdomen through the chest and to the face. People always shut their eyes when sneezing. During a sneeze, the air travels at a speed of approximately 100 miles per hour and disperses about 40,000 droplets, according to Science Line. This is one of the ways diseases spread from human to human.

Source: www.reference.com