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.
There are numerous conditions that are related to sneezing in cats. Some are chronic while others will only occur once. Nasal issues often cause pain to the cat and interfere with its intake of food. Dehydration and malnutrition are very serious issues in cats, especially if the cat is young. The discharge that accompanies the sneezing may be clear, cloudy, bloody or of a yellow/green color.