Nausea

nauseousnauseatedvomitingfeeling of sicknessGastrointestinal distressmotion sicknessnaseuanauseous remediespostoperative nausea and vomitingqualmishness
Nausea is an unpleasant, diffuse sensation of unease and discomfort, often perceived as an urge to vomit.wikipedia
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Vomiting

emeticvomitemesis
Nausea is an unpleasant, diffuse sensation of unease and discomfort, often perceived as an urge to vomit.
The feeling that one is about to vomit is called nausea; it often precedes, but does not always lead to vomiting.

Motion sickness

seasicknessseasicksea sickness
Some common causes of nausea are gastroenteritis and other gastrointestinal disorders, food poisoning, motion sickness, dizziness, migraine, fainting and low blood sugar. A number of conditions involving balance such as motion sickness and vertigo can lead to nausea and vomiting.
Symptoms commonly include nausea, vomiting, cold sweat, headache, sleepiness, yawning, loss of appetite, and increased salivation.

Migraine

migrainesmigraine headachemigraine headaches
Some common causes of nausea are gastroenteritis and other gastrointestinal disorders, food poisoning, motion sickness, dizziness, migraine, fainting and low blood sugar.
Associated symptoms may include nausea, vomiting, and sensitivity to light, sound, or smell.

Morning sickness

nausea and vomiting of pregnancypregnancy sicknessMorning nausea
Nausea is a side effect of many medications including chemotherapy, or morning sickness in early pregnancy. Nausea or "morning sickness" is common during early pregnancy but may occasionally continue into the second and third trimesters.
Morning sickness, also called nausea and vomiting of pregnancy (NVP), is a symptom of pregnancy that involves nausea or vomiting.

Antiemetic

antiemeticsanti-emeticanti-emetics
Medications taken to prevent and treat nausea are called antiemetics.
An antiemetic is a drug that is effective against vomiting and nausea.

Ondansetron

Zofran
The most commonly prescribed antiemetics in the US are promethazine, metoclopramide and the newer, extremely effective ondansetron.
Ondansetron, marketed under the brand name Zofran, is a medication used to prevent nausea and vomiting caused by cancer chemotherapy, radiation therapy, or surgery.

Promethazine

PhenerganPhensedylPrometh
The most commonly prescribed antiemetics in the US are promethazine, metoclopramide and the newer, extremely effective ondansetron.
It is used to treat allergies, trouble sleeping, and nausea.

Metoclopramide

ReglanClopraMaxolon
The most commonly prescribed antiemetics in the US are promethazine, metoclopramide and the newer, extremely effective ondansetron.
It is commonly used to treat and prevent nausea and vomiting, to help with emptying of the stomach in people with delayed stomach emptying, and to help with gastroesophageal reflux disease.

Indigestion

dyspepsiafunctional dyspepsiadyspeptic
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer.
Symptoms may include upper abdominal fullness, heartburn, nausea, belching, or upper abdominal pain.

Hypoglycemia

low blood sugarhypoglycaemiahypoglycemic
Some common causes of nausea are gastroenteritis and other gastrointestinal disorders, food poisoning, motion sickness, dizziness, migraine, fainting and low blood sugar.

Anxiety

anxiousnervousnessanxieties
Nausea may also be caused by anxiety, disgust and depression.

Helicobacter pylori

H. pyloriantibiotic-resistant ''H. pyloribacteria
Uncomplicated Helicobacter pylori infection does not cause chronic nausea.
Acute infection may appear as an acute gastritis with abdominal pain (stomach ache) or nausea.

Hyperemesis gravidarum

hyperemesisHyperemesis Graviderumsevere nausea and vomiting
While usually it is mild and self-limiting, severe cases known as hyperemesis gravidarum may require treatment.
Hyperemesis gravidarum (HG) is a pregnancy complication that is characterized by severe nausea, vomiting, weight loss, and possibly dehydration.

Vertigo

dizzinessvertiginousperipheral vertigo
A number of conditions involving balance such as motion sickness and vertigo can lead to nausea and vomiting.
This may be associated with nausea, vomiting, sweating, or difficulties walking.

Non-celiac gluten sensitivity

gluten sensitivitynon-coeliac gluten sensitivitygluten sensitive
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer.
Gastrointestinal symptoms may include any of the following: abdominal pain, bloating, bowel habit abnormalities (either diarrhea or constipation), nausea, aerophagia, flatulence, gastroesophageal reflux disease, and aphthous stomatitis.

Hepatitis

chronic hepatitisliver inflammationacute hepatitis
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer. These include: pancreatitis, small bowel obstruction, appendicitis, cholecystitis, hepatitis, Addisonian crisis, diabetic ketoacidosis, increased intracranial pressure, Spontaneous Intracranial Hypotension, brain tumors, meningitis, heart attack, carbon monoxide poisoning and many others.

Gastroparesis

delayed gastric emptyingdelayed stomach emptyingDiabetic gastroparesis
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer.

Disgust

revulsionloathingAppall
Nausea may also be caused by anxiety, disgust and depression.
When given a stimulus intraorally which had been previously paired with a nausea-inducing substance, rats will show conditioned disgust reactions.

Appendicitis

acute appendicitisruptured appendixburst appendix
These include: pancreatitis, small bowel obstruction, appendicitis, cholecystitis, hepatitis, Addisonian crisis, diabetic ketoacidosis, increased intracranial pressure, Spontaneous Intracranial Hypotension, brain tumors, meningitis, heart attack, carbon monoxide poisoning and many others.
Symptoms commonly include right lower abdominal pain, nausea, vomiting, and decreased appetite.

Gastroesophageal reflux disease

acid refluxgastroesophageal refluxGERD
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer.
Less common symptoms include pain with swallowing/sore throat, increased salivation (also known as water brash), nausea, chest pain, and coughing.

Pancreatitis

inflammation of the pancreasgallstone pancreatitispancreatic inflammation
These include: pancreatitis, small bowel obstruction, appendicitis, cholecystitis, hepatitis, Addisonian crisis, diabetic ketoacidosis, increased intracranial pressure, Spontaneous Intracranial Hypotension, brain tumors, meningitis, heart attack, carbon monoxide poisoning and many others.
Signs and symptoms of pancreatitis include pain in the upper abdomen, nausea and vomiting.

Pancreatic cancer

pancreaticpancreaspancreatic carcinoma
Chronic nausea may be the presentation of many gastrointestinal disorders, occasionally as the major symptom, such as gastroesophageal reflux disease, functional dyspepsia, gastroparesis, peptic ulcer, celiac disease, non-celiac gluten sensitivity, Crohn's disease, hepatitis, upper gastrointestinal malignancy, and pancreatic cancer.

Pregnancy

pregnantfirst trimesterpregnant women
Nausea or "morning sickness" is common during early pregnancy but may occasionally continue into the second and third trimesters.

Intracranial pressure

increased intracranial pressureintracranial hypertensionpressure inside the skull
These include: pancreatitis, small bowel obstruction, appendicitis, cholecystitis, hepatitis, Addisonian crisis, diabetic ketoacidosis, increased intracranial pressure, Spontaneous Intracranial Hypotension, brain tumors, meningitis, heart attack, carbon monoxide poisoning and many others.
In general, symptoms and signs that suggest a rise in ICP include headache, vomiting without nausea, ocular palsies, altered level of consciousness, back pain and papilledema.

Diabetic ketoacidosis

DKAketoacidosisacidosis
These include: pancreatitis, small bowel obstruction, appendicitis, cholecystitis, hepatitis, Addisonian crisis, diabetic ketoacidosis, increased intracranial pressure, Spontaneous Intracranial Hypotension, brain tumors, meningitis, heart attack, carbon monoxide poisoning and many others.
Predominant symptoms are nausea and vomiting, pronounced thirst, excessive urine production and abdominal pain that may be severe.