Deficiency can cause peripheral neuropathy, seborrheic dermatitis, glossitis, and cheilosis, and, in adults, depression, confusion, and seizures.
[merckmanuals.com]
Detailed evaluation revealed that psychological symptoms were of alcohol-dependent syndrome and neurological symptoms were due to alcoholic peripheral neuropathy.
[ijnpnd.com]
Other manifestations include anemia, peripheral neuropathy, and dermatitis.
[emedicine.medscape.com]