The most common cause of dementia is

Causes of Dementia:  Alzheimer’s  (most common in >65 years old) Vascular dementia/Multi-infarct dementia Lewy body dementia Fronto-Temporal dementia (50-70 years) Huntington’s Traumatic/Dementia pugilistica Creutzfeldt-Jakob disease   Reversible causes of Dementia Structural brain lesions:- Normal Pressure Hydrocephalus, SubDural Hematoma, Brain Tumors Alcohol dementia/ Wernicke’s encephalopathy Vitamin B12 deficiency Endocrine:- Hypo/Hyper-thyroidism, Hypo-Parathyroidism Metabolic disorders:- Dyselectrolytemia (Na, Ca, K), hepatic or renal failure Autoimmune:- Hashimoto’s paraneoplastic encephalopathy (anti- Yo, Hu, Ri) Infections:- Whipple’s, Lyme disease, Syphilis, HIV dementia.