Hand luggage restrictions plague every traveller choosing to keep their bags on them.
Liquids, sharp objects and powders are often subject to rules and many are not allowed onboard.
However, some items such as electronics are advised to only go in hand luggage and to not be checked in.
Another is medicines, which are always warned to be kept on the person at all times.
According to the UK.gov website, all medication prescriptions and medical items are allowed onboard.
The traveller must have documents to prove they are required by a medical professional, which can include a prescription.
Medicines such as tablets, liquids, inhalers and hypodermic syringes are all allowed onboard.
These are allowed to be more than 100ml which is the current restriction for liquids in hand luggage.
However, the Civil Aviation Authority (CAA) advise contacting the airline beforehand to confirm this is the case.
Additional security screening may also be required for the medicines.
The NHS advises: “Carry your medication in your hand luggage with a copy of your prescription.
“Pack a spare supply of medication in your suitcase or hold luggage (along with another copy of your prescription) in case you lose your hand luggage.”
For passengers who check in all of their medicine, it could have dangerous consequences.
Passenger Alvin Rogers from Ohio who attempted to travel by bus told News5Cleveland how, by checking a bag with his medicine in, ended up being without it.
After checking in his bag underneath the bus, the bags were then put onto another vehicle and never found, resulting in expensive costs to return home to replace the medicine.
A Ryanair passenger also found herself without her medicine after her hand luggage bag was deemed too big for the overhead lockers.
Passengers should ensure that they meet the luggage requirements even if travelling with medication.
Passenger Danni Rhode told Bristol Live that her bag was “full of medication” to be taken onboard.
However, a Ryanair spokesman said she “exceeded the allowable dimensions and was correctly advised to remove any valuable/required items from her bag, which was then carried in the hold free of charge”.