Cyclical vomiting syndrome

Also called CVS, Cyclic vomiting syndrome, or Abdominal migraine

Cyclical vomiting syndrome causes repeated attacks of intense nausea and vomiting that can last hours or days, separated by periods with no symptoms. It is more common in children but also affects adults. Attacks often follow a similar pattern each time.

Last updated Nov 9, 2026

What it is

The cause is not fully known, but it is linked with migraine. Triggers can include stress, excitement, lack of sleep and some foods. Regular heavy cannabis use can cause a similar condition.

Treatment includes avoiding triggers, medicines to stop or prevent attacks, and fluids during attacks to prevent dehydration.

Common signs

  • Episodes of severe nausea and vomiting
  • Tummy pain
  • Pale skin and tiredness
  • Feeling well between episodes

How it is usually diagnosed

  • Diagnosed from the pattern of attacks
  • Tests to rule out other causes, such as blood tests, scans and endoscopy

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • An attack diary with dates, length and triggers
  • Test results
  • Hospital discharge summaries
  • A care plan for attacks

Questions to ask your doctor

  • What can I take at the start of an attack?
  • Would preventive treatment help?
  • When should I go to hospital during an attack?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Signs of dehydration, such as drowsiness, very little pee or being unable to keep any fluids down, or vomiting blood: get urgent help

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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