Swollen Legs

Authored by Dr Mary Harding, 04 Jul 2017

Patient is a certified member of
The Information Standard

Reviewed by:
Dr Laurence Knott, 04 Jul 2017

Legs may swell for numerous reasons. Some of the possible diagnoses are listed in this leaflet.

It does cover a multitude of options, doesn't it? One leg or both legs could be swollen. If both legs, it could be symmetrical or worse on one side. A specific part of the leg(s) could be swollen, or the entire leg(s). It could have come on suddenly or gradually. It could be there all the time, or it could come and go. It could be painful nor not. Taking into account all these things will help narrow down the likely cause.

Most often the swelling comes from fluid in the spaces between the cells in the legs, and when this is the case it is called oedema. It is called pitting oedema if a dent made when you press with your fingertip stays in the skin after you have taken the fingertip away.

The swelling could also be coming from skin, bones, tendons - really from any tissue of the leg.

See also the separate leaflet called Oedema (Swelling).

Sometimes it is obvious ... you are tripped up in a football game, or you fall over an uneven pavement stone, and your leg is immediately painful, and swells up soon after. Either you have a sprain or you have broken a bone. But in other situations, both legs gradually become swollen over a week or a month, don't hurt, and you have no idea where the swelling has come from.

If both legs are swollen to the same level, this is likely to be oedema. There are multiple causes for this, including:

Further reading and references

What are lipoedema and lymphoedema?
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