Alzheimer's disease (AD) is a neurodegenerative disorder and main cause for dementia and characterized mainly by memory deficits. Causes and risk factors of AD includes increasing age, head injuries, genetic factors, environmental factors, vascular diseases, infections, etc. There is no proper cure for Alzheimer’s disease, only symptomatic treatments are available Cholinesterase enzyme Inhibitors and N-methyl d-aspartate (NMDA) antagonists are two classes of approved drugs to treat AD. Medicinal plants are traditionally used in the treatment of Alzheimer's disease. This paper focuses on the types of Alzheimer, diagnosis, neuropathology, stages, causes, risk factors and treatment of Alzheimer’s disease. There is a special focus on various classes of treatments, future theories for the development of new therapies for AD like disease-modifying therapeutics (DMT) and natural extracts