What are the signs of hyperthyroidism?
Hyperthyroidism affects every organ and body system. Some of these changes can be recognized by pet owners; others must be diagnosed by a veterinarian through physical examination or bloodwork. The most common sign is weight loss, often in the face of an increased appetite (although later in the disease, some cats become anorexic). Rate of weight loss varies among cats; some cats lose weight so gradually that their owners do not realize it is happening, and some cats lose weight very quickly. Affected cats often drink more water than normal, urinate frequently, have diarrhea, vomit, and have greasy or unkempt coats. These signs are also associated with diabetes and kidney disease and can only be distinguished by performing lab work. Many cats with hyperthyroidism have heart murmurs and high blood pressure because excess thyroid hormone causes the heart muscle to become thick and stiff. This is called thyrotoxic cardiomyopathy or hypertrophic cardiomyopathy. Affected hearts do not pump
