The parathyroid glands are right beside the thyroid gland.
Hypoparathyroidism is a condition caused by having parathyroid glands that don't make enough parathyroid hormone.
Pseudohypoparathyroidism is a condition with the same symptoms as hypoparathyroidism but caused by parathyroid hormone being ineffective.
Pseudopseudohypoparathyroidism is yet another condition which is similar to pseudohypoparathyroidism but lacks some of the symptoms and has a different cause again.
And megapseudopseudohypoparathyroidism is when you have pseudopseudohypoparathyroidism real bad. Okay, I made up this one. But the others are all real.