Parasitic infections affect millions of people worldwide each year. While many cases are mild and resolve with proper treatment, some parasites can cause significant illness if left untreated. Recently, health authorities in some regions have reported increases in certain parasitic diseases, often linked to contaminated food, unsafe water, international travel, or recreational water exposure.
One symptom that often draws attention is sudden, severe diarrhea, sometimes described as “explosive diarrhea.” Although this can occur with some parasitic infections, it is not unique to parasites and can also be caused by bacteria, viruses, or food poisoning.
What Is a Parasitic Infection?
A parasite is an organism that lives in or on another organism (the host) and obtains nutrients at the host’s expense.
Common intestinal parasites include:
- Giardia
- Cryptosporidium
- Entamoeba histolytica
- Roundworms
- Tapeworms
- Hookworms
Most infections affect the digestive tract, although some parasites can spread to other parts of the body.
Common Symptoms
Symptoms vary depending on the type of parasite but may include:
- Frequent diarrhea
- Sudden watery (“explosive”) diarrhea
- Abdominal cramps
- Nausea
- Vomiting
- Bloating
- Excess gas
- Fatigue
- Loss of appetite
- Unexplained weight loss
- Fever (sometimes)
- Dehydration
Some people have very mild symptoms or none at all.
