- Low blood sugar - hypoglycemia - can lead to a "depressed level of consciousness" and seizures, possibly a coma. An overdose of insulin is one cause. See Feline Diabetes.
- Hypocalcemia - this means low blood calcium. The symptoms are like those described above.
- Thiamin deficiency - seizures and "when lifted up, cats often flex their necks, dropping chin to chest.."
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