Vomiting

Vomiting is the forceful expulsion of stomach contents through the mouth, controlled by a 'vomiting centre' in the brain that can be triggered from many directions — the gut, the balance organs, the bloodstream and the brain itself. That is why the causes are so varied. The commonest are short-lived and benign: gastroenteritis (a stomach bug), food poisoning, too much alcohol, and, very commonly, early pregnancy. Motion sickness and migraine trigger it through other pathways. But vomiting is also a feature of more serious problems: a blockage or acute inflammation in the abdomen (such as appendicitis, gallstones, pancreatitis or a bowel obstruction), often with severe pain; conditions raising pressure in the brain (with a severe headache); diabetic emergencies; and reactions to medications. In practice, the everyday question is less 'why the vomiting' and more 'is this a simple upset, or is it a sign of something that needs urgent attention, and is the person becoming dehydrated'.

• Gastroenteritis (a stomach bug) — the commonest cause; often with diarrhoea, settles in a day or two.
• Food poisoning or too much alcohol.
• Early pregnancy — very common; always considered in women.
• Migraine and motion sickness.
• Medications — many can cause it, including some antibiotics, painkillers and chemotherapy.
• Acute abdominal conditions — appendicitis, gallstones, pancreatitis, bowel obstruction; usually with severe pain.
• Raised pressure in the brain — with a severe headache (serious).
• Diabetic emergencies (ketoacidosis).

A short bout of vomiting from an obvious cause needs no tests, just fluids. When vomiting is severe, persistent, or comes with worrying features, blood tests help: electrolytes (sodium, potassium) and kidney function, because repeated vomiting depletes fluid and salts, and glucose to check for a diabetic cause. Where abdominal inflammation is suspected, lipase (pancreatitis) and inflammatory markers, with imaging, are relevant, and a pregnancy test is checked in women. Mediora.AI can surface an electrolyte disturbance or a raised lipase pattern from your results, but persistent vomiting or vomiting with severe pain or headache needs prompt in-person assessment, not waiting on tests.