Once thought to be a problem occurring only in underdeveloped countries, parasites are found today in 30% of all stool analyses, leading the medical field to see that parasitic infections are much more common than previously thought. Not all parasites are necessarily harmful, some live symbiotically in the digestive tract. It is when an overgrowth of parasites occurs that the problem becomes pathogenic. Factors such as compromised immunity, poor digestion, and insufficient levels of good bacteria can support parasitic overgrowth. When parasitic infections occur, the symptoms vary widely and can include acute diarrhea and abdominal pain, fatigue, constipation, fever, IBS, chronic pain, severe weight loss, rashes and itchy skin and even autoimmune disorders.