Some people believe epilepsy is caused by evil spirits while others think the condition is contagious, according to new research which highlights the many misconceptions.
The survey for the National Society for Epilepsy (NSE) also found that more than one in 10 people believe that something should be put in the mouth of someone who is having a seizure.
Dr Sallie Baxendale, consultant neuropsychologist with the NSE, said people believe this will stop the person swallowing their tongue when it is actually dangerous and can affect their breathing or cause them to break teeth.
She said some of the misconceptions may be a result of the way epilepsy is portrayed on TV and in films.
"Only 50 per cent of people have seen a genuine seizure. Most people have seen a seizure on screen," she said.
She said many films showed that putting something in the mouth for the person to bite on had a calming effect. As an example, she cited the 1963 classic Cleopatra, which shows Caesar – played by Rex Harrison – having a seizure but becoming calmer once something is put in his mouth.
Dr Baxendale said there was a time when the word epilepsy would not be mentioned on screen, even if a person showed clear signs of the condition, but its profile has now been raised.
But she added that most of the publicity relates to the possible effect of flashing lights, such as the recent controversies about the logo for the London 2012 Olympics and revamped opening titles for BBC news.
In fact, only five per cent of people with epilepsy have photosensitive epilepsy.
Harry Gillespie, 21, of Worcestershire, who helped Leeds actor Sam Riley prepare for his role as Joy Division singer Ian Curtis in the 2007 film Control, said the question he is most frequently asked is if he can go to nightclubs.
He said people also expect to see a person collapsing and shaking during a seizure but fail to recognise the signs of partial seizure during which the person may appear normal but may be unable to listen or respond.
"I have been pushed off buses by bus drivers and broken my nose, all because they don't know what's going on," Mr Gillespie added.
Alan Morley, 56, from Nottingham, who has had epilepsy for 38 years said sometimes people do not realise he has had a partial seizure.
"Sometimes my wife won't notice, sometimes she will. I might ask her to repeat something."
More than 456,000 people in the UK have epilepsy according to the NSE, equivalent to one in every 131 people. Around 75 people are diagnosed with the condition every day.
The neurological condition is most commonly diagnosed in those under 20 or over 60.