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Hello. Thanks for the question.
It sounds like your cat has an URI (upper respiratory infection). This is very common in cats and causes sneezing, nasal discharge and ocular discharge. The cause of a URI in a cat is usually viral (herpes or chlamydia most commonly).
These URI's will usually run their course and resolve over 1-2 weeks. In severe cases I like to put these cats on an antibiotic to treat/ prevent any secondary infections.
Something you can do at home to help with the nasal congestion is run a hot shower and put the cat in the bathroom for 10-15 minutes. This can help break up the congestion. You can also pick up saline nose drops and put one drop in each nostril 3-4 times daily to moisten the nasal mucosa. Other than that, you usually just have to ride out the signs and wait for it to resolve on it's own.
I hope this helps, let me know if you have any other questions.
I'm happy to help.
This is very common in kittens and young cats. Most will do well with symptomatic care, but a round of antibiotics does typically resolve things a lot faster.