'I'm a travel insurance expert - here's the simple mistake that could cost you thousands'

Experiencing health issues while on holiday that require medical treatment can be incredibly stressful. The situation can become even more daunting if you discover that you're not covered by your insurance provider, potentially leaving you with a bill for hundreds or even thousands of pounds.

Forgetting to declare a pre-existing medical condition, or providing incorrect information, could mean that your insurance policy will not cover you if you require medical treatment while on holiday.

Grant Winter, a compliance officer at specialist travel insurance provider Good to go, shared his advice for ensuring you're not left without insurance cover, reported MirrorOnline.

Grant said: "Failing to declare pre existing medical conditions when taking out travel insurance can result in your policy being invalidated should you need to claim on your insurance, meaning your claim may not be paid in full, or declined completely.

"In many cases, people simply forget about a longstanding medical condition, or don’t think it’s necessary to declare. These conditions often include medical conditions where the person has been taking medication for years, like high cholesterol or high blood pressure. A simple rule of thumb is that if you’re taking prescription medication for something, you will need to declare it."

"Entering incorrect travel dates can result in you being uninsured for part of your holiday, and therefore unable to claim should you need medical treatment on these dates," Grant explained.

"This is also important if you’re doing a multi centre holiday, and visiting multiple countries, where you will need to confirm when you will leave and return to the UK, and the countries you will be visiting. If you have an annual policy,