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The Motherisk Nausea and Vomiting of Pregnancy (NVP) ForumMotherisk receives questions from around the world about morning sickness symptoms, effects, treatments and ways to cope. Those questions and answers are posted here for anyone to read, provided the reader acknowledges and accepts the proviso and disclaimer below.
Symptoms and causes
Where is the line drawn between NVP and HG? Is there a difference between the two? Is HG just a more severe form of NVP? The only definitions I have found for HG suggest 5% weight loss and hospitalization.
It is difficult to draw the line precisely between NVP and HG, since the causes are multifactorial. Also, each pregnancy and each woman is different.
While NVP occurs in 50% to 80% of all pregnancies, HG affects 1% or 2% of these women and can only be defined as the most severe form of NVP, not responding to typical treatment, often resulting in hospitalization, and weight loss of approximately 5%. It is also essential to exclude all other causes for the symptoms. For example, H Pylori stomach infection can manifest itself in a similar manner.