A deficiency can make daily tasks feel exhausting
Alcoholism, malabsorption, prolonged stress, tapeworm infestation, vegan diets, celiac, hyperthyroidism, hepatic-biliary tract disease, persistent diarrhea, ileal resection, pancreatic cancer, renal disease, macrobiotic diets or other restrictive diets
This can show up as symptoms such as delayed growth and development (failure to thrive), regression in neuromotor skills (such as losing the ability to roll over or grasp objects), failure to maintain eye contact (even in an infant who previous could do so), general muscle weakness, lethargy, excessive sleepiness, feeding difficulties, and even brain shrinkage
Trigeminal neuralgia is also associated with multiple sclerosis and other disorders that affect the myelin sheath, as well as nerve compression by a tumor
The Yellow Card scheme: guidance for healthcare professionals