Any brain and nerve function disease affects the connection between the cranial nerve and its associated center inside the brain. Some examples of brain and nerve function diseases are Bell's palsy, glossopharyngeal neuralgia, hemifacial spasm, internuclear opthalmoplegia, conjugate gaze palsies, hypoglossal nerve disorder and trigeminal neuralgia.

Usually when it comes to brain and nerve function disease, the severity of the symptoms of the disease depends on how much damage the nerve has sustained. For instance, very often the nerves controlling the movement of the eyes are damaged. So, if this damage is causing problems with the movement of the eye in the same direction and only one eye can move in a particular direction, the person will suffer from double vision.

Usually diagnosing a brain and nerve function disease is done with the help of a neurologic examination and doing simple tasks. The neurologic examination helps to figure out the disorders associated with the brain, nerves and spinal cord. In addition, the doctor will take down detailed medical history. If the doctor suspects brain and nerve function disease, he may order a diagnostic or series of diagnostic procedures to confirm the disease. However, in some cases the doctor may order a psychiatric evaluation as there maybe no cause for the disorder or the disease to manifest itself.

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