Meningitis

Meningitis is a disease that causes inflamation to the protective membranes  that cover the brain and the spinal cord.  This inflamation is caused by either a virus or a bacteria.  It a medical emergency that can cause death.  When the infection is bacterial, medications are available.  My daughter became infected with this disease at 2 days old.  I was released from the hospital with what I believed to be a healtyh newborn.  But one hour after being released I was in the emergency room with a crying baby.  Her neck was stiff. Babies heads are wobbly and unable to hold it straight, but in my baby's case it was different.  The first thing they had to do was withdraw fluid from the spine to find if a bacterial disease was present.  After getting a positive result, they started medication through her foot.  It was two weeks of hearing that she could die within the next 48 hours, to perhaps living in a vegetative stage to finally being released with a possibility of a hearing impairment.  Only time would tell who severe her learning disabilities would be.  But the medical field can only go so far and God will do the rest.  Thirteen years later, she is a normal teenager with no trace of ever being contracted with a deadly disease.http://children.webmd.com/vaccines/meningitis

Epilepsy

Epilepsy is also a brain disorder. A seizure or convulsion is caused when abnormal electrical charges occur between nerves in the brain.  When this happens, the normal electrical activity is interrupted and this causes temporary loss of communication between cells.  People who experience these seizures are unaware of what is happening to them.  The seizures vary in intensity.  Some people's body completely shake and they fall.  Others have "staring moments" or temporary forget where they are or what they were doing.  They notice a strange odor that doesn't exist.
I have witnessed the more severe seizures where the person convulses between 1 to 4 minutes.  Their bodies become rigid and they shake from head to toe.  After the convulsion has ended they remain unconscious and have trouble breathing.  They expel some kind of foam from their mouth and generally cannot function for a couple of hours.  These seizures leave them exhausted.  Medication does exist to try and control the episodes but there is no cure.  Patients have to routinely get their blood levels checked and other side effects are common.  Such as swollen gums (to the point where there teeth are barely visible).  It takes time for doctors to find the right combination of drugs to control the seizures and the patients will have to be under medication for life.  I have known of a couple of cases where the patient has died during one of these episodes. 
The brain still continues to surprise me.