There will always be a variation of symptoms among individuals as no two persons are alike in the manifestations within the disease process. Dementia does not look the same in George as it does in your neighbor Ethel. Some persons show major memory changes while others have trouble with speech, problem solving, personality, social judgement, or mood. The different dementias have differing onset symptoms unlike another dementia that may be specifically memory. For example, FTD Frontotemporal Dementia manifests mainly with speech, personality, and social awareness changes before memory loss appears. This is where misdiagnosis can happen especially when symptoms can even mimic psychiatric conditions such as anxiety or depression.
When a person has co-existing medical conditions, it can blur the diagnosis even further. Diseases such as diabetes, hypertension, thyroid disease, or vitamin deficiencies, —–all of which can affect cognition underscores the importance of performing a baseline laboratory workup. Such problems as medication side effects, dehydration, infections or sleep disorders can cause reversible confusion that resembles dementia. Without a thorough medical evaluation, these treatable causes, may be mistaken for dementia leading to an incorrect labeling and unnecessary despair.
Potentially, some psychiatric disorders such as depression, can also imitate dementia, a condition sometimes referred to as pseudodementia. In these cases, the person may show memory loss, poor concentration, and apathy, but the underlying condition is severe depression rather than degeneration of the brain. The distinction is crucial because depression related cognitive impairment can improve dramatically with treatment, whereas dementia symptoms typically worsen over time. Assessment of mood, motivation, and emotional history is important to differentiate the two.