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Parasitic infections occur when organisms such as protozoa, worms, or ectoparasites live on or inside the human body and obtain nutrients from their host. These infections can affect the digestive system, skin, blood, lungs, muscles, or other organs. Common examples include malaria, giardiasis, amoebiasis, tapeworm infections, hookworm infection, scabies, and pinworm infection.
Symptoms vary according to the parasite and the body area involved. People may experience abdominal pain, diarrhoea, nausea, weight loss, fatigue, fever, itching, skin rashes, or anaemia. Some parasitic infections cause mild or no symptoms initially, while others can lead to serious complications if left untreated. Children, travellers, and people living in areas with poor sanitation may have a higher risk of exposure.

Diagnosis may involve stool examinations, blood tests, imaging studies, or microscopic identification of parasites. Treatment depends on the specific infection and may include antiparasitic medicines prescribed according to the organism involved. Maintaining proper hand hygiene, drinking safe water, thoroughly cooking food, wearing protective footwear, and controlling insects can reduce the risk of infection.

Prompt medical evaluation is important when symptoms persist, especially after travel or suspected exposure. Appropriate diagnosis and treatment can help eliminate the parasite, relieve symptoms, prevent complications, and reduce transmission to others.