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Low levels are most commonly a lab error but in some cases, low levels may be due to hyperparathyroidism, kidney problems, heart disease, and certain cancers

Chronic fatigue and postexertional malaise in people living with Long COVID: an observational study

He added that B12 deficiency "can be undiagnosed or underdiagnosed since symptoms can be nonspecific," like cognitive slowing, fatigue, tongue swelling, arm or leg tingling, and difficulty walking

Postherpetic Neuralgia follows a rash called herpes zoster. Often called shingles, it is caused by the same virus that causes chickenpox
