If you have parasites in your stomach, the main symptoms are abdominal pain and diarrhea, or combined with fever and anemia. If you have the above symptoms and suspect that you have parasites, you can go to the hospital to do relevant tests. First of all, you can do a pathogenic examination, which is to look for worms in body fluids or secretions, such as fecal smear or coagulant method to check for intestinal protozoa mycoplasma, cysts, or eggs, and terminal blood smear to look for malarial parasites, etc. Parasites in the parasitic tissues can be diagnosed through biopsy and puncture examination. In addition to pathogenetic tests, immunologic tests, including in vivo and serum immunologic tests, are commonly performed. Other tests include molecular biology and imaging, which can be done by ultrasound or CT.