A case report published in The New England Journal of Medicine highlights the range of possible symptoms: “Over the course of two months, a 62-year old man developed numbness and a ‘pins and needles’ sensation in his hands, had trouble walking, experience severe joint pain, began turning yellow, and became progressively short of breath.”
As Harvard Health points out, this case report does not capture the full list of symptoms, however.
In addition to deep depression, paranoia and delusions, memory loss, and incontinence, loss of taste and smell has also been observed in patients with low B12 levels.
The link to loss of smell is attributed to the damage B12 deficiency inflicts on the nervous system.
READ MORE: Vitamin B12 deficiency symptoms: The unusual sign on your skin to watch out for