If you fall hard on your back and have a headache and nausea shortly afterward, the most likely reason is that you hurt your head during the fall and that caused a concussion. However, it is also possible that another, slightly different injury is causing these symptoms; visit your doctor for a correct diagnosis.

Dementia is a group of symptoms involving impaired mental functions, including memory and reasoning. Alzheimer’s disease is the most common cause. According to the Cleveland Clinic, as many as 50 other known causes exist.

The brain contains three main parts: the forebrain, the midbrain and the hindbrain. The cerebrum is the largest part of the brain. Located in the forebrain, it is divided into the frontal lobe, parietal lobe, occipital lobe and temporal lobe.

Neurontin, or gabapentin, is a medication that is commonly used to control partial seizures in epileptic patients. This medication increases the amount of GABA, which is a chemical that slows down nerve conduction in the brain.

In epilepsy, abnormal electrical activity in the brain causes seizures, according to the Mayo Clinic. The diagnosis of epilepsy is given when there are two or more seizures; epilepsy can be treated with medication or with surgical procedures.

A healthy diet is important for keeping you energized physically, but poor nutrition habits also link to neurological, or brain, problems like memory loss. Small amounts of essential vitamins found in your daily diet supply you with the functional nutrients you need to maintain brain and body health.

Dopamine is a neurotransmitter, which is an important chemical substance found in the brain, according to MedlinePlus. Dopamine is responsible for the body’s voluntary movements including sleep, appetite, attention and working memory.

The brain consists of four lobes: the frontal, temporal, occipital and parietal. Imagining a line on the top of the head from ear to ear, the portion of the brain at the top of the skull just to the rear of the line is the parietal lobe.

Dopamine is a neurotransmitter found in the brain that aids in several aspects of brain function. These areas include motor function and mood, and possibly the best-known role dopamine plays relates to your perceived happiness.

“LR 6, SO 4, 3” is one of the many expressions that medical students across the country memorize, for it represents three of the cranial nerves and the eye muscles that they affect. There are actually 12 cranial nerves; three of them stimulate the eye muscles, while three others affect the eye in other ways.

Hemorrhage means "to bleed." Trauma or disease can cause cerebral blood vessels to rupture and hemorrhage.

Headache is the most common symptom of brain tumors. Although the brain itself feels no pain, other structures including blood vessels, the covering of the brain, and nerves in the head produce pain in response to pressure or displacement caused by a tumor.