• Alternative Names

    Amebic dysentery; Intestinal amebiasis


    Most people with this infection do not have symptoms If symptoms occur, they are seen 7 to 10 days after being exposed to the parasite.

    Mild symptoms:

    • Abdominal cramps
    • Diarrhea
      • Passage of 3 - 8 semiformed stools per day
      • Passage of soft stools with mucus and occasional blood
    • Fatigue
    • Excessive gas
    • Rectal pain while having a bowel movement (tenesmus)
    • Unintentional weight loss

    Severe symptoms:

    • Abdominal tenderness
    • Bloody stools
      • Passage of liquid stools with streaks of blood
      • Passage of 10 - 20 stools per day
    • Fever
    • Vomiting

    Signs and tests

    Examination of the abdomen may show liver enlargement or tenderness in the abdomen.

    Tests include:

    • Blood test for amebiasis
    • Examination of the inside of the lower large bowel (sigmoidoscopy)
    • Microscope examination of stool samples, usually several days apart