Epilepsy is a chronic neurological disorder characterized by recurrent, unprovoked seizures. It's one of the most common neurological diseases globally.

A seizure is a sudden, uncontrolled burst of electrical activity in the brain. It temporarily disrupts how the brain cells communicate, leading to a wide range of symptoms.

Seizures: The Core Symptom

It's important to understand that having one seizure does not mean you have epilepsy. Epilepsy is diagnosed when a person has two or more unprovoked seizures (meaning they weren't caused by a temporary trigger like a high fever, low blood sugar, or alcohol withdrawal).

Seizures are broadly classified into two main groups:

1. Focal Seizures (Partial Seizures)

These seizures start in and affect only one part of the brain.

Simple Focal: The person remains aware during the seizure. Symptoms can be motor (e.g., twitching of a limb), sensory (e.g., strange smells or tastes), or emotional (e.g., sudden fear).

Complex Focal: The person has impaired awareness or loses consciousness. They may perform repetitive, purposeless actions like lip-smacking, rubbing hands, or walking in circles.

2. Generalized Seizures

These seizures involve both sides of the brain from the start.

Tonic-Clonic (formerly "Grand Mal"): This is the most well-known type. It involves a tonic phase (body stiffening, loss of consciousness) followed by a clonic phase (convulsive jerking of muscles).

Absence (formerly "Petit Mal"): Most common in children, this involves brief "staring spells" where the person suddenly stops all activity and appears to be daydreaming for a few seconds.

Atonic Seizures: Also called "drop attacks," causing a sudden loss of muscle tone, which makes the person fall down.

Causes

The cause is unknown in about half of all cases. In other cases, epilepsy can be linked to specific factors, including:

Genetics: Some types of epilepsy run in families.

Brain Injury: Traumatic brain injury (TBI) from an accident.

Brain Damage: From a stroke (a leading cause in older adults) or a brain tumor.

Infections: Diseases like meningitis or encephalitis.

Developmental Disorders: Such as autism.