There are several things you can do of course, from riding it out if it doesn't seem too severe to making an appointment with your vet and getting to the bottom of the problem. To that end, one of the most important things you can do is to learn about what some of the most typical illnesses, sickness or diseases are that may afflict your feline friend.
Learning about the most common cat diseases your cat may get, gives you a heads-up into what you and your cat experience if afflicted by one of them. For example, you can learn about feline leukemia, kidney disease, worms, hyperthyroidism and several others. You should learn about symptoms, what to expect for treatment, the costs associated with it, and more.
When dealing with any feline illness, the more knowledge available, the better you can make an informed decision. You should learn about the treatments and preventive measures to keep your cat thriving and flourishing for as long as they live.
The Bottom Line
Whenever you choose to bring a kitten or a cat into your home, among other things, you have just become the primary caregiver in their life. The quality of life that your pet has is directly dependent on you, what you feed them, providing a sanitary litter box, and how you interact with them, whether it's playtime, grooming or even common surgical procedures like spaying or neutering. That also means that when a problem occurs, or your kitty becomes ill, it's your responsibility to take care of it.
Learning about the health problems your cat can encounter is one of the best ways to stay in tune with your cat's health needs, which will serve both of you well, for life.