Himalayan cats, like all cats, can be susceptible to a variety of feline diseases. Some common feline diseases that Himalayans, as well as other cat breeds, may develop include:

1. Upper respiratory infections: This is a common disease among cats, and it can cause symptoms such as sneezing, runny nose, and eye discharge.
2. Feline dental disease: This is a common issue among cats and can result in bad breath, difficulty eating, and loss of teeth.
3. Feline infectious peritonitis (FIP): This is a viral disease that affects cats and can lead to inflammation of the abdomen, fever, and loss of appetite.
4. Feline leukemia virus (FeLV): This is a viral disease that can weaken the immune system, leading to a range of health problems, including anemia and cancer.
5. Feline immunodeficiency virus (FIV): This is a viral disease that weakens the immune system and makes cats more susceptible to other infections and diseases.
6. Kidney disease: This is a common issue in older cats and can result in a decrease in appetite, weight loss, and increased thirst.
7. Hyperthyroidism: This is a common condition in older cats that results in an overactive thyroid gland, causing weight loss, increased appetite, and increased thirst.

It’s important to keep in mind that many of these diseases can be prevented or managed with proper veterinary care, including regular check-ups, vaccinations, and a healthy diet. Additionally, routine dental care can help prevent dental disease and regular parasite control can prevent flea infestations and other parasites that can lead to disease.

Overall, it’s important to be aware of the potential health issues that your Himalayan cat may face, and to work with your veterinarian to create a comprehensive health plan to keep your cat healthy and happy. Regular check-ups and preventive care can go a long way in ensuring that your Himalayan cat stays healthy for many years to come.