It may seem obvious that a long-haul flight has caused the condition to develop in a passenger on such a flight, but there are other factors that can have an adverse effect on the circulation.

BBC: Your comments on Economy Class Syndrome

The Preferred WeGoLook service includes the Looker providing his or her general observations about the basic external cosmetic condition of the item (looking for the presence of obvious chips, cracks, dents, etc.) and report those observations to you.

FORBES: Can't Look At An Online Purchase Before You Buy? WeGoLook can

Since the symptoms of primary aldosteronism aren't always obvious, your doctor may be the one to suggest you set up an appointment to get screened for the condition.

CNN: Primary aldosteronism

But Mrs Low was back with us very quickly, Richard Low a few hours later, and as I say they're both in remarkably good physical condition and they, it's the only hard evidence I have, they are not suffering any obvious ill-effects.

BBC: Breakfast with Frost