Hello there! Have you already seen a doctor about the problem? Nothing can be said by stating just two symptoms.
It is very important to say if you suffer/ed from any medical problems.
How long has the swelling been present? At what part of the left side of your
abdomen is the swelling? Is it always present? When does the
back pain appear? What is the back pain like (constant, occasional, throbbing, sharp, mild, etc)? How old are you? Are you male/female? Had anything like this before?
Knowing some of these facts could help think of what it could be but you can’t be diagnosed like this. You won’t know for sure until you see a GP.
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