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Oppressive conditions, with the heat index into the low triple digits, presented an especially demanding challenge for Lester, who has dealt with fatigue and excessive perspiration stemming from hyperparathyroidism.

A meeting with an endocrinologist over the winter yielded a diagnosis of hyperparathyroidism, leading to a corrective procedure.

His operation was March 5 for hyperparathyroidism, which can affect the amount of calcium levels in the bloodstream and lead to someone tiring easily.

He consulted with an endocrinologist this winter, was diagnosed with hyperparathyroidism last week, then underwent surgery in New York to remove one of his four parathyroid glands.

"This thing" turned out to be hyperparathyroidism, which can affect the amount of calcium levels in the bloodstream and lead to someone tiring easily.