The only linkage between epilepsy, migraines and bipolar disorder is that all these diseases begin in the localized region of the head. Epilepsy mainfests when neurons in some part of the brain's structure become hyperactive and produce excessive electrical impulses. Depending upon the location of the hyperactive neurons, the symptoms of epilepsy can be very different (loss of consciousness, muscle cramps, unreal sensations-hallucinations etc.). Symptoms occur unexpectedly. The etiology of epilepsy can be known (tumors, cerebral-vascular insults, vascular anomalies, infections, traumas etc.) or unknown (genetically conditioned).
By contrast, a migraine manifests via an unexpected headache attack. Sometimes migraines "announce" an incoming headache (aura) and can include visual sensations. Usually, only one half of the head registers the pain. The etiology of the migraine is unknown. It is believed that vascular spasms of brain arteries cause this type of sever headache. Additionally, a migraine could be psycho-emotionally conditioned.
Bipolar disorder is a severe psychiatric disorder (psychosis) that affects the mood. Two phases of completely opposite mood types vary in persons with bi-polar disorder-mania and depression. A manic phase brings about an abnormally good mood without good cause. Manic phases are also characterized by hyperactivity of any kind (laughing, talking, sexual, moving etc.). Conversely, a depressive phase exhibits an extremely bad mood without cause, unreasonable feelings of guilt for unreal events, lack of will for anything, suicidal wishes, etc. The etiology of the disease is unknown, but bi-polar disorder is probably genetically conditioned.