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Blood calcium levels are influenced by diet, protein levels and blood hormone levels. Low levels can indicate damage to the pancrease or parathyroid. Muscle twiches might appear when the levels are low.
Dr. Goldstein says in his book, Nature of Animal Healing, that low calcium levels may indicate deficiency of pancreatic enzymes.
Low calcium levels can be a sign of hyperthyroidism in cats. Take a look at this informative article for more information:
I hope that this helps you to understand it a little better.
I completely understand where you are coming from. We lost our cat of 17 year a couple of weeks ago due to kidney failure.
Renal failure can mess up the appetite and it can also make a cat lose its vision completely so you might even see more side effects as this progresses, if it is kidney failure.
I am so sorry for what you are going through. I know that this can't be an easy time for you.