What triggers seizures?

What doesn't? Dehydration, use of illicit drugs, infections both at the level of the brain and spinal cord as well as anywhere else in the body medications, flashing lights, noncompliance with anti-seizure medication regimen, strokes, metabolic disorders, trauma to the head, hyperventilation. Does that list seem complete enough to cover whatever you might be thinking? There very well may be other causes as well.
LACK OF INHIBITION. The brain functions in a homeostatic balance with both excitatory and inhibitory neurotransmitters in balance. Individual nuclei have an "inhibitory surround" to prevent inadvertent firing. If an abnormal brain lesion blocks normal connections, the inhibition is blunted and excitation pre-dominates, sensitizing a spread of electrical action, which could trigger a seizure.
Many conditions . many conditions can trigger a seizure. There usually needs to be a scar on the brain at your age group. Infection, lack of sleep and skipping meals can lower the seizure threshold enough to trigger a seizure.

Related Questions

What can trigger a seizure?

Anything. Stress, light, any diseases in body the lead to toxins, hypoglycemia, starvation.Tumors of brain, medications, dehydration, strokes, etc. Almost anything. Read more...
Many things. Depends upon the person. Could include: sleep deprivation, drugs, alcohol, flashing lights, overbreathing, fever, infection, other medications. A small number of people have seizures that are triggered by fairly normal stimuli- such as reading, or certain sounds. Read more...

My girlfriend recently told me that she's epileptic, What might trigger a seizure and what should I do if one happens?

What 2do 4 seizure. Seizures are more likely in the setting of sleep-deprivation, infection, and medication withdrawal / irregular use. When you see someone with a seizure, help them to the ground, so they cannot fall, turn them to one side, and give them some time to recover. Most seizures last 30-90 sec. If the sz does not stop in 5 min, call 911. Read more...

How do you figure out what triggers a simple partial seizure?

MRI +EEG. If you are sure this was a simple partial, there is an area of the brain which triggered it, may be scay, tumour, vascular, stroke , but sometimes we do not find cause. Read more...
EEG and imaging. The diagnostic test include an EEG. Next, Imaging a CAT scan MRI scan to determine if there is a gross structural abnormality. Unfortunately, we do not have an imaging test that is capable of identifying microscopic abnormalities of the brain. Read more...