Seizure triggers

Taking epilepsy medicines regularly, as prescribed by your doctor, will help to keep a steady level of the medicine in your body.

Missing one or more doses of your epilepsy medicine is one of the most common seizure triggers. There can be many reasons for missing medicines. These include forgetting to take it, or not taking it due to the worry of possible side effects. You may be more likely to miss a dose if you’re tired or stressed.

It is important to follow advice from your doctor about how to take your medicine. Sometimes they can interact with other medicines. If you change medicines, there might be different instructions about how to take them.

Many people with epilepsy say that feeling tired or not sleeping well can trigger seizures. This can end up causing a cycle, as having seizures can affect your sleep and make you even more tired.

Lack of sleep and tiredness seem to be triggers for both generalised and focal seizures.

It’s not known exactly why stress might trigger seizures. But many people with epilepsy say that if they’re feeling stressed, they are more likely to have a seizure.

For some people, feeling stressed can lead to other changes. This might include feeling anxious or depressed, or changes to your sleeping patterns or eating habits. All of these can also increase your risk of having a seizure.

Some people report they’re more likely to have seizures when they have a high temperature due to an infection. This can be a particularly common seizure trigger in children. It might be a more common trigger in people who have focal seizures.

We have more information about febrile seizures which are linked with high temperatures, but are not epilepsy.

Some people with epilepsy find that they are more likely to have seizures at certain times of their period (menstrual cycle). There’s some evidence this might be more likely to affect you if you have focal seizures.

Find out more about catamenial epilepsy here.

Having one or two drinks from time to time is usually fine for most adults with epilepsy. But drinking larger amounts can increase your risk of having seizures, especially after you stop drinking.

Drinking alcohol can also affect your sleep, and may make you more likely to forget to take your epilepsy medicines. This can also increase your seizure risk.

Find out more about alcohol and epilepsy here.

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Recreational drugs include illegal drugs and ‘legal highs’. There is no control over what goes into these drugs. They can be dangerous and they can trigger seizures. This includes recreational cannabis (marijuana or weed).

Like alcohol, taking cannabis can also make you more likely to have disturbed sleep or miss doses of epilepsy medicine.

This does not include medical cannabis that’s been prescribed by a doctor. Medical cannabis contains pure cannabidiol and can help in some types of epilepsy.

About 3 to 5 in every 100 people with epilepsy (3-5%) have seizures that are triggered by flashing or flickering lights. This is called photosensitive epilepsy.

If you have photosensitive epilepsy, both natural and artificial light may trigger seizures. This includes light from devices and screens, like TVs, tablets, smartphones and games consoles. You might even find that some patterns, like stripes or checks, trigger seizures.

You would usually have a seizure when you are looking at the trigger, or shortly after.

There are lots of other factors that people report as possible triggers. A lot of the time, there is little evidence to say for certain whether these things do definitely trigger seizures.

Examples include:

• Exercise – Research suggests that regular exercise can help to reduce your chance of having seizures. Exercise is thought to have benefits for both your body and mind. But there have been some reports of extreme or strenuous exercise causing seizures. It is not clear from the studies whether the exercise caused the seizures
• Missing meals – some people with epilepsy report this as a trigger, but there’s not much evidence to prove a link
• Caffeine in food and drinks – it’s unclear whether caffeine may protect against seizures or make them more likely, due to limited evidence
• Essential oils – these are a form of complementary therapy that some people report as being a trigger
• Smoking and vaping – it’s been suggested that nicotine, or other compounds in cigarette smoke or vape fluids could trigger seizures
• Weather – changes in the weather and extreme temperatures have been reported as seizure triggers, but evidence is mixed

Remember that triggers are different for everyone. Not all of the factors listed above will affect you. What might be a trigger factor for one person may not have any effect on you.