Parkinson's disease is a disorder of the basal ganglia, which plays a dominant role in movement. Those with Parkinson's will develop a tremor at rest, an increase in rigidity, and slowness in carrying out movements. The neurotransmitter dopamine plays an important role in the development of the disease and the degeneration of dopaminergic fibers occurs in Parkinson's disease. Huntington's Disease is characterized by hyperactivity (rather than a decrease, which is found in Parkinson's disease. GABAergic neurons may be affected during the early stages of the disease, causing over activity. Alzheimer's disease is a neurodegenerative disease that involves memory loss. Meningitis is an infection that causes inflammation of the meninges of the brain. Grave's disease is an autoimmune condition that is characterized by an overproduction of thyroid hormones. 

Acetylcholine is the neurotransmitter used at the neuromuscular junction. The antibodies produced against acetylcholine receptors at the neuromuscular junction prevent synaptic transmission, causing the muscle weakness and fatigue characterized by Myasthenia Gravis. Epinephrine(also known as adrenaline) is a monoamine that plays an important role in the sympathetic nervous system. GABA is the main inhibitory neurotransmitter in the brain. Dopamine is neurotransmitter that plays an important role in the body's pleasure and reward system. It is characterized as a catecholamine. Serotonin is a monoamine neurotransmitter that acts throughout the body and plays a role in depression and happiness. 

Insomnia is a sleep disorder, in which people have trouble falling or staying asleep. It can be an acute or chronic disorder. Insomnia can cause other problems such as anxiety, inattention, or depression. It can be treated by lifestyle changes, medication, or therapy.

Narcolepsy is a disorder that leads to extreme daytime sleepiness and/or muscle weakness. It causes people to fall asleep suddenly, even in the middle of tasks. There is no cure, but it can be managed by medicine, lifestyle changes, or therapy.

Sleep apnea is a disorder in which you stop breathing at night while asleep. Often, those suffering from the disorder are not aware they wake up at night to breathe. It creates a poor quality of sleep, which leads to daytime sleepiness.

Hydrocephalus occurs when there is a disruption in the circulation of cerebral spinal fluid or CSF. This can cause swelling of the head and may be treated by shunting some of the excess CSF out of the cranial cavity. Temporomandibular joint (TMJ) disorder affects the jaw and is caused by a misalignment of joints. Hemorrhagic fever is caused by an infectious agent, like the Ebola virus. Uncontrollable cell growth is also known as cancer. 

Epilepsy is also known as a seizure disorder and is a disorder of the nervous system. A seizure is a short term change in normal brain activity. There are two types of seizures: generalized, which affects both sides of the brain, and focal, which affects one area of the brain. Ebola is caused by a virus that causes hemorrhagic fever. Cerebral edema is classified by swelling of the brain, which can cause irreversible damage and death in severe cases. Elephantiasis is a symptom classified by excessive swelling of a certain part of the body.

Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is a progressive disease that attacks the nerve cells that control voluntary movement. It is not known what causes ALS and there is currently no treatment. The US has a registry that tracks who gets ALS in an attempt to understand the disease. 

Autism Spectrum Disorder (ASD) has a wide range of signs or symptoms. These can vary from mild to severe, depending on the individual. There is no single cause for autism and there is no cure. Treatment includes management of behaviors, therapy, interventional services. 

Meningitis is an illness that features fevers, headaches, and stiff necks. This is a serious illness that can be fatal if not treated promptly. It typically begins showing symptoms 3-7 days after exposure. If the infection is bacterial in origin, it can be treated effectively with antibiotics. If it is viral, the treatment is supportive in nature.