Three main classes of parasites can cause disease in humans: protozoa, helminths, and ectoparasites. Protozoa and helminths largely affect the gut, while ectoparasites include lice and mites that can attach to or burrow into the skin, staying there for long periods of time.
Read MoreTwo people in Victoria and New South Wales have died after eating smoked salmon contaminated with listeria, health authorities report. Both were over 70 and had underlying health conditions.
Health authorities are also investigating a non-fatal Queensland case.
But some people will experience constipation more often, and for longer periods. Chronic constipation is generally defined as a problem that has persisted for six months or more. It can mean you have hard or lumpy stools that you’re straining to pass, or are passing fewer than three stools per week – or both.
Read More© Gut Dr 2026. All Rights Reserved.