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    Understand Your Options for Treating Hyperthyroidism in Cats

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    Hyperthyroidism is very common in middle aged to older cats and occurs when the thyroid gland produces too much thyroid hormone. Symptoms commonly seen are weight loss despite a great appetite, poor hair coat, increased drinking and urination, vomiting and or diarrhea, rapid heart rate, hyperactivity, increased yowling and irritability. 


    Researchers have linked the disease to two dietary habits of our cats. The first link to a cat's diet was found in cats that consume large amounts of commercial fish-flavored cat food, as they were more likely to develop the disease than cats with a cleaner, more holistic diet. The second link was discovered through limiting the amount of iodine in a cat’s diet, as it often returned the cat to normal thyroid hormone levels. 

    Western Treatments for Hyperthyroidism

    Radioactive iodine. To receive this treatment your cat would have to go to a specialist center and be hospitalized for 3 to 7 days. The medication kills off the thyroid gland so the condition goes away. This is the most effective conventional treatment but it is costly.

    Surgery - This is not done very frequently anymore with the availability of radioactive iodine but this was the standard treatment and is still done.

    Medication - Tapazole is the most common medication used although there are others. This medication can cause problems with the cat’s blood, liver disease, decreased appetite, lethargy and vomiting. There is also a warning for humans giving this medication to wear gloves and not break the pills as there can be side effects in people.

    Diet - Hills Prescription Diet Y/D is now available for cats with hyperthyroidism. This diet is iodine deficient and works by starving the thyroid gland of iodine. If the thyroid gland does not have a source of iodine, then it can not make thyroid hormone so the condition goes away. This can be recommended in cases where the cat’s can not take conventional medication. It should not be used along with any thyroid medication including herbal. The problem with this diet is we do not know the long term risks of iodine deficiency and in multiple cat households it would not be great for the normal cats to consume this diet. The dry form of this is almost vegetarian which is not ideal for carnivores like cats. The wet form at least has liver in it so is a bit better.

    Holistic Treatments for Hyperthyroidism

    Homemade diet with restricted iodine - High levels of iodine are found in fish as well as iodized salt, sea salt, aged cheeses, egg yolk, sea-products, including kelp, cured meats, bread and pasta, molasses, soy sauce, soy milk, meats injected with flavor enhancers,and fish oils – including cod liver oil. All of these need to be avoided.

    Herbal supplements - Enhance your cat's treatment with supplements that support the thyroid and the liver. Two important supplements are Milk Thistle and Thyroid Support Gold. These are safe and can be used even when the cat’s thyroid levels are high normal. When used in this manner, you may prevent the thyroid from becoming overactive.

    Thyroid Support Gold (2 oz.) (1060+ Reviews) Thyroid Support Gold works to  sustain the normal equilibrium of metabolism and supports a shiny coat, healthy  heart, and normal sleeping patterns. Our ideal balance of complementary  botanical ingredients maintains long-term, normal function of your cat's  thyroid gland. LEARN MORE

    Meet Our Expert

    Dr. Janice Huntingford

    Pet Wellbeing's own Dr. Jan has been in veterinary practice for over 30 years. Since receiving her Doctor of Veterinary Medicine at the Ontario Veterinary College, University of Guelph, she's founded two veterinary clinics and lectured extensively on pet herbal therapy, nutraceuticals, acupuncture, rehabilitation and pain management.

    Dr. Jan has studied extensively in both conventional and holistic modalities, helping us to formulate all of our supplements. She is an essential part of Pet Wellbeing.

    And lucky for us, she's only one of the great team of people who make Pet Wellbeing so special.

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