If your cat is sneezing occasionally I would not be too worried. If he is sneezing up discharge/snot then I would take him to a veterinarian. Also if he has a decrease in appetite, decreased energy, or stops drinking I would take him to a veterinarian.
Cats can get upper respiratory infections--these can be viral or bacterial in nature. The bacterial infections typically require treatment. The viral infections will often resolve as long as no other signs develop.
Cats can get upper respiratory infections--these can be viral or bacterial in nature. The bacterial infections typically require treatment. The viral infections will often resolve as long as no other signs develop.