What is the definition or description of: pseudodementia?

Cognitive problems: Which are caused by depression, lack of sleep, adverse effects of medication. Many elderly can be presumptively labeled as having alzheimer's disease when in reality they have a reversible problem such as low thyroid or b-12 deficiency and with treatment, they return to normal baseline.

Usually Depression: Pseudodementia is when a medical condition acts as a chronic memory problem, but is not due to a problem with the brain’s memory system. It is commonly due to depression; often in the elderly. Symptoms are from poor attention and motivation in depression. It differs from dementia as patients are aware of their cognitive problems, tend to say “i don’t know” to questions, and memory fluctuates.

Depression impairmen: Cognitive impairment (e.g., memory problems) may occur in people who are depressed and may improve be treatment of depression. However, very often these people develop progressive dementia later on.