<s>[INST] 3 days ago my abdomen began to fill swollen and uncomfortable and when I pressed on my left side it was tender...then two days ago I was having pain in the center under my brest bone that radiated to my back...yesterday it was back to the swollen feeling and today I have twinges on my left side. Any ideas? [/INST] Hello and welcome to Chat Doctor, Fullness of abdomen and feeling uncomfortable and swelling on left side suggests splenomegaly. However, clinical assessment and ultrasound of the abdomen is required for assessment of abdominal organs. You need to consult your primary health provider for interpretation of ultrasound and thus further management. Enlarged spleen can occur in number of conditions like infections, hematological disorders, storage diseases etc. Thanks and take care Chat Doctor.  </s>