I had a kitten that used to have severe sneezing fits. They freaked me out every time they happened because I didn't think they were going to stop.
The short version of this story is about a year later, the vet diagnosed her with herpes in her nose. Hard to diagnose. Definitely have the vet check it out and bring up upper-respiratory infections, allergies, and maybe herpes. Like I said, it took a year to diagnose Booger because the vet didn't even think of herpes.
The Maine Coon Mafia (litter mates)
Casey - Male Maine Coon, 3 years
Mak - Male Maine Coon, 3 years
The abandoned newcomer: Linus - Male Tabby, 1 year
Minnie - Female Tortie, RIP 9/3/93-8/18/09 (In Heaven, but never far from our hearts)
The Pooches... Best friends for life.
Miko - Male Chi/Terrier mix, 2 years
Mansa - Male Pit Bull, 1 year