Using an online symptom checker is simple. For instance, you might be a 45 year old woman from the UK who is currently experiencing headache, a fever and a sore throat.

Inputting this information into the symptom checker will give you some likely ‘common’ diagnoses. These include: strep throat, tonsillitis, sinusitis and flu.

But the self-diagnosis calculator will also give a list of rarer but more serious diagnoses in a tab called ‘red flags’. If, after reading the information, you think one of these serious conditions could apply to you, you should seek medical advice immediately.

‘Sign’ and ‘symptom’ are often used interchangeably, but if we’re going to be pedantic, they do actually mean different things.

If you’re feeling ill it might not be immediately obvious to somebody looking at you that you’re sick. For instance, if you’re experiencing pain, fatigue or dizziness, only you know what that feels like. These are symptoms - which can only be described by the person experiencing them.

Signs, on the other hand, can be observed by an outsider too. For example, indicators to other people that you’re unwell, such as: sweating, sneezing or looking pale. Or, things that can be measured, such as a high blood pressure reading or a fever determined with a thermometer, count as signs

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