I need to know more about early onset alzheimers. is it always present or can you appear fine one minute and then completely out of touch the next?

Generally dementia: Comes on gradually over time. On the other hand, once diagnosed there are variations in clarity of though and memory. Usually memory is better in the morning then diminishes with fatigue known clinically as sun downing. There is also a range so that "perfectly normal" and "out of touch" are two ends of a spectrum not typical with alzheimer's. There may be med issues or another concurrent dx.

Dementia, Alzheimers: Dementia is short-term memory loss. It begins to get more serious as time goes on. You may recall things from childhood, but not what you ate yesterday. It is usually constant, but you can have brief periods when you are more alert. As the mind gets tired, memory worse, like at night. Thus, sundowners effect. Would not be on & off though.

Can be subtle: Characteristically, pts with mild alzheimer's seem socially appropriate, and have subtle problems with memory and daily functions such as organizational skills, so on first glance, may mislead and create the appearance of normal function, but the disease is progressive and does not remit. All early alzheimer's pts can benefit from meds available. Discuss with neurologist.