Medical Engineering encompasses a broad range of activities, and is alternatively called Bioengineering and Biomedical Engineering.
Just like humans, cats can develop allergies to things in the environment. Cat allergies can be caused by many different things, and the cause usually has to be figured out by a process of elimination. Sneezing that's caused by an allergy is often accompanied by scratching and other skin problems. These include frequent rubbing of the face and excessive grooming which may cause hair loss.
A physical examination will be necessary to diagnose the cause of your cat's sneezing behavior, as well as a medical history. Other signs, such as nasal discharge, eye discharge, bloody discharge, fever, loss of appetite, and sores or lesions in the mouth can indicate an upper respiratory infection.