It's very important to take your cat to the vet immediately. Runny nose and lethargy in cats can be signs of a variety of serious health issues, including:
* Upper respiratory infections (URIs): These are common in cats and can be caused by viruses or bacteria.
* Feline leukemia virus (FeLV): A serious viral disease that weakens the immune system.
* Feline immunodeficiency virus (FIV): Another viral disease that affects the immune system.
* Allergies: Cats can be allergic to things like pollen, dust mites, and mold.
* Dental disease: This can lead to infections that can spread to other parts of the body.
* Other underlying medical conditions: Kidney disease, diabetes, and even cancer can cause these symptoms.
Please do not try to treat your cat at home without veterinary guidance. A vet can diagnose the cause of the symptoms and recommend the appropriate treatment, which may include:
* Antibiotics: To treat bacterial infections.
* Antivirals: To treat viral infections.
* Supportive care: To help your cat feel better and recover.
Prompt veterinary attention is crucial for your cat's health and well-being.