Why do i get hg every pregnancy

Overview

Hyperemesis gravidarum (HG) is a severe form of nausea and vomiting during pregnancy that affects approximately 0.3-3% of pregnant individuals worldwide, with higher rates reported in some populations. First described medically in the 19th century, HG gained broader recognition in the 20th century through systematic studies. The condition differs significantly from typical morning sickness in both severity and duration, often requiring medical intervention. Historical records suggest HG has affected pregnant individuals throughout human history, though it was often misunderstood or attributed to psychological causes. Modern research, particularly since the 1990s, has established HG as a biological condition with genetic and hormonal components. The HER Foundation, founded in 2002, has been instrumental in advancing research and support for affected individuals. Studies show HG hospitalization rates vary by region, with some countries reporting up to 2% of pregnant individuals requiring hospitalization for the condition.

How It Works

HG's exact mechanisms involve complex interactions between hormonal, genetic, and gastrointestinal factors. Human chorionic gonadotropin (hCG) levels, which peak around weeks 8-11 of pregnancy, correlate strongly with HG symptoms, though not all individuals with high hCG develop HG. Genetic predisposition plays a significant role, with studies showing a 30% increased risk if a first-degree relative had HG. The GDF15 gene, identified in 2018 research, appears particularly important in HG susceptibility. Gastrointestinal motility changes and heightened sensitivity to smells and tastes contribute to the vomiting reflex. The condition involves abnormal signaling between the brain's vomiting center and gastrointestinal tract, often exacerbated by dehydration and electrolyte imbalances. Treatment typically involves a stepped approach starting with dietary modifications, progressing to vitamin B6 and doxylamine combinations (approved by the FDA in 2013), then to antiemetic medications, and finally hospitalization for intravenous fluids and nutrition in severe cases affecting approximately 1% of HG patients.

Why It Matters

HG has significant medical and social consequences, with affected individuals experiencing higher rates of pregnancy termination (up to 15% in some studies), depression, and post-traumatic stress. The condition causes substantial economic burden through healthcare costs and lost productivity, with estimates suggesting thousands of dollars per affected pregnancy. Beyond physical symptoms, HG impacts family dynamics, career trajectories, and future family planning decisions. Public awareness increased significantly after high-profile cases like Kate Middleton's pregnancies in 2012-2018, leading to greater research funding and clinical attention. Proper management reduces risks of complications like Wernicke's encephalopathy (from thiamine deficiency) and fetal growth restriction. Understanding recurrence patterns helps clinicians provide anticipatory guidance and early intervention in subsequent pregnancies, improving outcomes for the approximately 15-81% of individuals who experience HG recurrence.