Drivers have been warned they could be fined up to £1,000 unless they declare six surprising health conditions to the DVLA.
The government states you may be prosecuted if you’re involved in an accident as a result of an undeclared illness.
You must also give up your licence if your doctor tells you to stop driving for three months or more, or if you do not meet the required standards for driving because of your medical condition.
Motoring experts from car rental comparison site StressFreeCarRental.com have shared six illnesses and ailments that must be declared, including vertigo and sleep apnoea.
While some conditions – like epilepsy and head injuries – should obviously be reported, other illnesses have unexpected side effects which could impact a driver's ability to operate a motor vehicle properly.
As a result, you should notify the UK’s Driver and Vehicle Licensing Agency if you suffer from conditions like insulin-treated diabetes, and even déjà vu.
A spokesperson for StressFreeCarRental.com said: "A few of the conditions we’ve highlighted are obscure, but when you consider their side effects, it’s clear to see why the DVLA need to know.
"If you forget and are involved in an accident as a result of your health condition, it could even lead to prosecution – so it's really imperative to make sure you’re abiding the rules.
"The rules for certain health conditions differ for bus, coach or lorry drivers, so it’s always best to double-check."
The following conditions must be declared to DVLA:
You need to tell DVLA if you have diabetes treated by insulin, and your insulin treatments last or will last over three months.
This applies if you had gestational diabetes too.
You should also let them know if you get disabling hypoglycaemia, which is low blood sugar, or if a medical professional has told you you’re at risk of developing it.
If you experience dizziness that is sudden, disabling, or recurrent, you must tell DVLA.
This applies to car, motorcycle, bus, coach and lorry drivers.
You must tell DVLA if you have seizures or epilepsy that cause déjà vu.
Déjà vu is a neurological anomaly related to epileptic electrical discharge in the brain, creating a strong sensation that an event or experience currently being experienced has already been experienced in the past.
You should talk to your doctor if you’re not sure if your déjà vu is related to seizures or epilepsy.
4. Sleep apnoea
There are several sleep disorders that you should tell DVLA about, including confirmed moderate or severe obstructive sleep apnoea syndrome (OSAS), narcolepsy, cataplexy, and any other sleep condition that has caused excessive sleepiness for at least three months.
You should also notify them if you’re taking medication that has caused excessive sleepiness for three months.
You must tell DVLA if you have labyrinthitis, which is an inner ear disorder that can cause dizziness, nausea and loss of hearing.
6. Heart palpitations
If you regularly have heart palpitations, which are heartbeats that suddenly become more noticeable and may feel like pounding, fluttering, or irregular beating, the DVLA require you to inform them.
Other conditions may also need to be reported to the DVLA.
If you're unsure, you can use government's A to Z listings to check if you need to report your condition and find the relevant form or questionnaire.