Some causes of memory problems include sleep apnea, silent stroke, medications, nutritional deficiency and head injury, according to Everyday Health. Other causes include alcohol, tobacco or drug use; dementia; Alzheimer’s disease; and underactive or overactive thyroid glands, reports WebMD.
Severe infections around the head and mild head injuries contribute to loss of concentration, memory loss and confusion. American Brain Tumor Association indicates that tumors inhibit the brain’s ability to process and store information, reports Everyday Health. Tumor treatment, radiation therapy, chemotherapy and brain surgery affect memory coordination. Depression, anxiety and stress contribute to memory problems as they impact on brain function. Insufficient vitamin B-1 and B-12 results in dementia and confusion due to abnormal nerve function, as expressed by WebMD.