Alzheimer's Disease is a progressive neurodegenerative disorder that affects memory, thinking, and behavior. It is the most common cause of dementia.

Parkinson's Disease is a progressive neurodegenerative disorder that affects movement, coordination, and balance. It is the second most common neurodegenerative disease after Alzheimer's Disease.

Multiple Sclerosis is a chronic autoimmune disease that affects the central nervous system. It causes inflammation and damage to the myelin sheath, which insulates nerve fibers.

Huntington's Disease is a hereditary neurodegenerative disorder that affects the basal ganglia, a group of structures deep within the brain. It causes involuntary movements, cognitive impairment, and psychiatric symptoms.

Alzheimer's Disease is characterized by the accumulation of amyloid plaques and tau tangles in the brain, which lead to the loss of neurons and synapses.

Parkinson's Disease is characterized by the loss of dopamine-producing neurons in the substantia nigra, a region of the midbrain.

Multiple Sclerosis is characterized by the demyelination of nerve fibers in the central nervous system, which leads to inflammation and damage to the nerves.

Huntington's Disease is caused by a mutation in the huntingtin gene, which leads to the production of a toxic protein that damages neurons in the brain.

Common symptoms of Alzheimer's Disease include memory loss, difficulty with language and communication, and changes in mood and behavior.

Common symptoms of Parkinson's Disease include tremors, rigidity, bradykinesia (slowness of movement), and postural instability.

Common symptoms of Multiple Sclerosis include muscle weakness, fatigue, vision problems, and difficulty with coordination and balance.

Common symptoms of Huntington's Disease include involuntary movements, cognitive impairment, psychiatric symptoms, and difficulty with swallowing and speech.

There is currently no cure for Alzheimer's Disease, but there are treatments that can help to manage the symptoms.

There is currently no cure for Parkinson's Disease, but there are treatments that can help to manage the symptoms.

There is currently no cure for Multiple Sclerosis, but there are treatments that can help to manage the symptoms.

There is currently no cure for Huntington's Disease, but there are treatments that can help to manage the symptoms.