It is particularly common among people who are on their feet all day, or could even be triggered by warm weather.
The condition – also known as oedema – is a build up of fluid in the body which can cause tissue to become swollen.
However, the condition could also be a sign of an underlying health problem.
Possible causes of swollen legs, feet or ankles can include heart failure, chronic lung disease or kidney disease.
It could also be an indicator of varicose veins, which can get worse during warm weather or among people who have been standing up too long.
Odema associated with kidney disease usually occurs in the legs, and also around the eyes.
This is because damage to the blood vessels in the organ can result in nephrotic syndrome – where falling levels of a protein called albumin in the blood can lead to fluid accumulation and oedema.
Swelling in the legs or ankles can also be a sign of heart disease – which occurs when the heart pumps blood around the body less effectively.
This can cause fluid to build up in the legs.
However, medication used to treat other condition could also cause oedema.
Corticosteroids, prescribed to treat condition such as COPD, eczema, arthritis, or inflammatory bowel disease could also cause oedema.
Calcium channel blockers (CCBs) – a group of medicines commonly prescribed to treat conditions including high blood pressure and angina – can also cause oedema.
The British Heart Foundation said: “The most common side effects of dihydropyridine CCBs are ankle swelling, flushing and constipation.”
NHS Choices said oedema can be temporary and can clear up by itself. However experts have also recommended losing weight, taking regular exercise – such as walking, swimming or cycling and raising legs to improve circulation.
People with the condition should also avoid standing up for long periods.
However if the problem doesn’t go away, people are advised to see their GP.