Here's why:
* The third eyelid, also called the nictitating membrane, can indicate a serious health issue. It could be a sign of:
* Eye infection or irritation: This could be from allergies, foreign objects, or even something more severe.
* Dry eye: This condition can lead to discomfort and even vision loss.
* Systemic illness: Problems like feline leukemia or other serious conditions can affect the eyes.
* Trauma: A recent injury could have caused the third eyelid to become visible.
What to do:
1. Contact your veterinarian immediately. Explain the situation and describe what you've noticed.
2. Make an appointment as soon as possible. Don't delay in getting your cat checked.
3. Follow any instructions your vet gives you. This may include bringing your cat in for an exam, administering eye drops, or starting treatment.
It's important to remember: I am not a veterinarian, and I cannot provide medical advice.