‘Morning sickness’ refers to the nausea and vomiting which occur in the first months of about half of all pregnancies, though symptoms can in fact occur at anytime of day. The aetiology is unknown; neurological, endocrine, metabolic and psychological causes have all been proposed and it may be that all play a part. This note discusses the management of the milder symptoms, and does not deal with hyperemesis gravidarum where vomiting becomes persistent and leads to metabolic disturbances.
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