Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
People who have early onset Alzheimer's may be in any stage of dementia â early stage, middle stage or late stage. The disease affects each person differently and symptoms will vary. If you are experiencing memory problems: 1  Have a comprehensive medical evaluation with a doctor who specializes in Alzheimer's disease.
Hypothalamic dysfunction: Rare Types. Rare types of diseases and disorders in related medical categories: 1  Brain & Neurological Disorders: Rare Types: 2  Adult ADHD -- Rare Types. 3  ADHD -- Rare Types. 4  Alzheimer Disease -- Rare Types. 5  Migraine -- Rare Types. 6  Concentration Disorders -- Rare Types. 7  Stroke -- Rare Types.