Morning sickness generally consists of nausea, vomiting, dizziness, etc. These could definitely be signs of pregnancy
Morning sickness, also called nausea gravidarum, nausea, vomiting of pregnancy (emesis gravidarum or NVP), or pregnancy sickness is a pregnancy discomfort that affects more than half of all pregnant women. Sometimes symptoms are present in the early hours of the morning and reduce as the day progresses. However, in spite of its common name, it can occur at any time of the day. For most women it may stop around the 12th week of pregnancy.
Related to increased estrogen levels, a similar form of nausea is also seen in some women who use hormonal contraception or hormone replacement therapy. The nausea can be mild or induce actual vomiting, however, not severe enough to cause metabolic derangement. In more severe cases, vomiting may cause dehydration, weight loss, alkalosis and hypokalemia. This condition is known as hyperemesis gravidarum and occurs in about 1% of all pregnancies. Nausea and vomiting can be one of the first signs of pregnancy and usually begins around the 6th week of pregnancy (counting gestational age from 14 days before conception).
Hyperemesis gravidarum (HG) is a complication of pregnancy characterized by intractable nausea, vomiting, and dehydration and is estimated to affect 0.5–2.0% of pregnant women. Malnutrition and other serious complications, such as fluid or electrolyte imbalances, may result.
Hyperemesis is considered a rare complication of pregnancy, but because nausea and vomiting during pregnancy exist on a spectrum, it is often difficult to distinguish this condition from the more common form of nausea and vomiting experienced during pregnancy known as morning sickness.
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