Hookworm Infection
What is Hookworm infection?
Hookworm infection is a parasitic disease caused by tiny worms that live in the small intestine. These worms attach to the intestinal wall and feed on blood, which can lead to anemia and nutritional problems over time. Hookworms are most common in warm, moist climates where sanitation is poor.
The infection spreads when hookworm eggs in human feces contaminate soil. The eggs hatch into larvae that can penetrate bare skin, usually through the feet. Once inside the body, the larvae travel through the bloodstream to the lungs, then up to the throat where they are swallowed. They eventually reach the small intestine where they mature into adult worms.
Hookworm infection affects more than 400 million people worldwide, though it is rare in developed countries. Children and people who walk barefoot in contaminated areas face the highest risk. With proper treatment, most people recover fully within weeks.
Symptoms
- Itchy, burning rash at the site where larvae entered the skin
- Abdominal pain and cramping
- Diarrhea or loose stools
- Nausea and loss of appetite
- Extreme tiredness and weakness
- Pale skin due to anemia
- Weight loss and malnutrition
- Coughing or wheezing when larvae pass through the lungs
- Blood in stool in severe cases
Many people with mild hookworm infections have no symptoms at first. Symptoms typically develop as the worm burden increases and anemia worsens. Children with chronic infections may experience growth delays and cognitive problems due to nutritional deficiencies.
Concerned about Hookworm infection? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Hookworm infection occurs when hookworm larvae penetrate the skin after contact with contaminated soil. The parasites enter through bare feet when walking on soil where infected people have defecated. Poor sanitation, lack of proper toilets, and the use of human feces as fertilizer create conditions where hookworms thrive. Walking barefoot in tropical and subtropical regions with high humidity increases exposure risk.
Risk factors include living in or traveling to areas with poor sanitation, walking barefoot outdoors, agricultural work involving soil contact, and living in crowded conditions. Children who play in dirt and people who work in fields without protective footwear face higher infection rates. Weakened immune systems and existing nutritional deficiencies can worsen the effects of hookworm infection.
How it's diagnosed
Hookworm infection is diagnosed by finding hookworm eggs during a microscopic examination of the stool. This test is called an ova and parasites stool test. A healthcare provider collects a stool sample and sends it to a laboratory where technicians look for parasite eggs under a microscope. Multiple stool samples collected on different days may be needed because egg shedding can be irregular.
Blood tests may also be ordered to check for anemia and low protein levels caused by chronic blood loss. A complete blood count can reveal low red blood cell counts and reduced iron levels. Talk to a doctor about testing if you have symptoms or have traveled to areas where hookworm is common. Our team can help connect you with appropriate diagnostic resources.
Treatment options
- Antiparasitic medications like albendazole or mebendazole to kill the worms
- Iron supplements to treat anemia caused by blood loss
- Protein-rich diet to address malnutrition and support recovery
- Vitamin supplements if nutritional deficiencies are present
- Follow-up stool tests to confirm the infection has cleared
- Wearing shoes outdoors to prevent reinfection
- Improved sanitation and hygiene practices
- Treating all household members if multiple people are infected
Frequently asked questions
The first sign is often an itchy, burning rash where the larvae entered the skin, usually on the feet. This rash appears within a few days of exposure and is sometimes called ground itch. As the infection progresses, you may develop abdominal pain, diarrhea, and fatigue. Many people have no symptoms in the early stages.
You get hookworm by walking barefoot on soil contaminated with hookworm larvae from infected human feces. The larvae penetrate through the skin, usually on the feet. The infection is most common in warm, humid areas with poor sanitation. You cannot get hookworm from pets or from person to person contact.
Yes, chronic hookworm infection can cause severe anemia from ongoing blood loss. This leads to extreme fatigue, weakness, and shortness of breath. In children, long-term infection can cause malnutrition, delayed growth, and cognitive problems. Pregnant women with hookworm face increased risks of complications and low birth weight babies.
Hookworm is diagnosed by examining stool samples under a microscope to find hookworm eggs. This is called an ova and parasites stool test. You may need to provide multiple stool samples collected on different days. Blood tests can also show anemia and low protein levels that suggest hookworm infection.
Antiparasitic medications like albendazole and mebendazole are the primary treatments for hookworm. These drugs kill the adult worms in the intestine. A single dose is often effective, though some cases need a longer course. Your doctor will also prescribe iron supplements to treat anemia if your blood counts are low.
Most people start feeling better within a few weeks after treatment. The antiparasitic medication kills the worms quickly, but it takes time for your body to recover from anemia. Iron levels may take several months to return to normal. Follow-up stool tests are done to confirm the infection has cleared completely.
Yes, wearing shoes outdoors is the most effective prevention method. Avoid walking barefoot in areas where hookworm is common, especially in soil or sand. Use proper toilets and sewage systems to prevent soil contamination. Washing hands thoroughly after touching soil also reduces risk.
Hookworm is now rare in the United States due to improved sanitation and infrastructure. However, small outbreaks still occur in poor rural areas with inadequate sewage systems. Travelers returning from tropical regions may also bring infections back. Historically, hookworm was widespread in the southern United States until the mid-1900s.
The infection will not return unless you are exposed to hookworm larvae again. The medication kills all the worms in your body. However, reinfection can occur if you continue walking barefoot in contaminated areas. Wearing shoes and improving sanitation prevent repeat infections.
Yes, you should see a doctor if you suspect hookworm infection. Untreated hookworm can cause severe anemia and malnutrition over time. A doctor can order the proper stool tests, prescribe antiparasitic medication, and monitor your recovery. Children, pregnant women, and people with severe symptoms should seek care promptly.