You didn't write the reason for taking Ultrasound abdomen.
Enlargement of liver is called hepatomegaly and that of spleen is called Splenomegaly.If both are enlarged,it is called Hepatosplenomegaly
There are many causes of Hepatosplenomegaly. Most common causes are Infections like Acute viral hepatitis
,Malaria etc;Blood related diseases like Leukemia,Pernicious anaemia;Metabolic disorders,Chronic liver disease
and portal hypertension
You didn't mention whether you are alchoholic or not.
You have to consult your Physician/Gastroenterologist for further investigations and exclude the causes one by one.
All the best.
Hope everything comes normal.