My husband has been experiencing nausea, severe heartburn, some diarrhea, fatigue, and cramping sometimes. We spent a week in Costa Rica and thought he had eaten something bad there. His doctor took a stool specimen but found nothing. Put him on 2 rounds of antibiotics -just in case. Drew blood last week. His enzymes came in abnormally high. She has now ordered a CAT scan. What are some of the causes of abnormal enzymes?