Borrelli E, Heyman RA, Arias C, Sawchenko PE, Evans RM Transgenic mice with inducible dwarfism [Only registered and activated users can see links. Click Here To Register...] Kidney disease, because low calcium is especially common in those with kidney failure Symptoms of high calcium such as fatigue, weakness, loss of appetite, nausea, vomiting, constipation, abdominal pain, urinary frequency, and increased thirst Symptoms of very low calcium such as abdominal cramps, muscle cramps, or tingling fingers Other diseases that have been associated with abnormal blood calcium such as thyroid disease, parathyroid disorder, malabsorption, cancer, or malnutrition