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Seizures are indeed primarily caused by an electrical overload of the brain. This phenomenon occurs when there is a sudden surge of electrical activity in the brain's neurons, which can disrupt normal communication between nerve cells. This electrical malfunction can manifest as a variety of seizure types, ranging from generalized convulsions to subtle changes in awareness or behavior.

The brain relies on a delicate balance of excitatory and inhibitory signals to maintain normal function. Factors that can lead to this overload include neurological disorders such as epilepsy, brain injuries, or metabolic disturbances. Recognizing that seizures stem from this electrical imbalance helps in understanding the underlying mechanisms and potential treatments associated with seizure management.

In contrast, while reduced blood flow to the brain and infections within the central nervous system can lead to other neurological symptoms and, in some cases, may provoke seizures, they are not the primary causes of seizure activity. Likewise, excessive oxygen levels in the bloodstream, though potentially harmful, typically do not directly lead to seizures. Understanding the mechanism behind seizures being related to electrical activity is crucial for effectively responding to and managing patients who experience them.