Welcome to healthcare magic forum..
is diagnosed on clinical examination. Other causes such as lymphadenitis
, appendicular mass, diverticulitis
are all responsible for similar symptoms. I cannot specify more specific causes without an abdominal examination. You will need a thorough abdominal examination, few blood tests that include a complete blood counts, with an ultrasound
examination of the abdomen to diagnose the condition.
I suggest you to get these done. Further management will be based on the reports of the tests.