Pain. Vague epigastric or periumbilical pain progresses to right lower quadrant pain usually accompanied by low-grade fever, nausea ,and sometimes vomiting. Tenderness.
[nurseslabs.com]
lymphadenitis, mittelschmerz, obstruction, pancreatitis, parasites, peptic ulcer disease, sarcoidosis, spirochetosis, tuberculosis, tumors, typhlitis, urinary tract infection
[pathologyoutlines.com]
[…] etiology is suspected to be the cause of abdominal pain, laboratory studies comprisingof a complete blood count (CBC) and evaluation of inflammatory parameters is mandatory, as leukocytosis
[symptoma.com]