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Question:

Hyperthyroid, Senior Cat w/ the Runs & a Murmur

I’m feeling really overwhelmed and could use some advice. My sweet 16-year-old cat, Tigger, has been having a really tough time lately. A few months ago, he was diagnosed with hyperthyroidism, and we’ve been managing it with medication, but now things seem to be getting worse. He’s been having chronic diarrhea, and my vet just mentioned that she heard a heart murmur during his last check-up. I’m so worried because he’s losing weight and seems more lethargic than usual. I’ve tried adjusting his diet to something more gentle, but nothing seems to be helping. I’m really scared for him, and I just want to make sure I’m doing everything I can to keep him comfortable and happy. If anyone has gone through something similar or has any advice on how to manage all these issues, I’d be so grateful. Thanks in advance for any help.

Answer:

Hello there,



I understand you're worried about your senior cat, especially dealing with hyperthyroidism, diarrhea, and a heart murmur. Let's break down what might be happening here.



Hyperthyroidism is common in older cats and can often cause diarrhea because your kitty's metabolism is in overdrive, impacting how nutrients are absorbed. The heart murmur could be related to increased blood flow from the hyperthyroid condition, but it needs monitoring to ensure it's not progressing to heart disease.



At home, try keeping your cat hydrated, as diarrhea can lead to dehydration. Offering clean, fresh water at all times is important. You might also want to feed a bland diet — think plain chicken or rice — to help settle their stomach, but make dietary changes gradually.



Keep an eye out for weight loss, decreased appetite, or lethargy, as these could be signs that the condition is worsening. If the diarrhea is severe, persistent, or if your cat seems uncomfortable or in pain, it's time to consult a vet.



I'd recommend booking a video consultation with one of our vets for a more tailored plan and to explore potential treatments or dietary adjustments. They'll provide you with the best guidance to manage your cat's health with these conditions. Looking forward to assisting further!

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 23, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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