Cyclical Vomiting Syndrome

What is Cyclical Vomiting Syndrome?

Cyclical vomiting syndrome (CVS, also called cyclic vomiting syndrome) is a chronic disorder of gut-brain interaction marked by recurrent, similar episodes of intense nausea and vomiting that last hours to days.^[1] Between episodes, people return to their usual health.^[1]

Common symptoms

Episodes involve nausea, vomiting and often abdominal pain.^[2] CVS is frequently associated with migraine headaches, anxiety, depression and autonomic dysfunction, which add to the burden of the illness.^{[1, 2]} Repeated vomiting can cause dehydration, which is why episodes sometimes need emergency care.^[2]

Causes and risk factors

The cause is unknown. Genetic, environmental, autonomic and neurohormonal factors are all thought to play a role, and CVS is closely linked with migraine, probably through shared mechanisms.^[2] Episodes are often set off by stress or an intercurrent illness, and a subset of people have a strong family history of migraine.^[3]

CVS affects both children and adults, and it is more common in women.^[2]

How it is diagnosed and treated conventionally

There is no specific test for CVS. A physician makes the diagnosis from the pattern of episodes using the Rome criteria, after ruling out other causes of recurrent vomiting.^{[1, 2]} Minimal recommended testing includes an upper endoscopy and imaging of the abdomen.^[2]

Adult guidelines recommend a tricyclic antidepressant such as amitriptyline as first-line preventive medicine, with topiramate or aprepitant as alternatives. They suggest serotonin-blocking antiemetics or triptans to stop an attack, and treating coexisting anxiety, depression, migraine and sleep problems.^[4] The evidence behind many of these medicines is of very low quality.^[5] Those same guidelines say meditation, relaxation and biofeedback may be offered as complementary therapy.^[4]

Why Cyclical Vomiting Syndrome calls for a whole-person approach

CVS is not a single-cause illness. Nervous system sensitivity, stress, sleep, mood and other conditions interact, and guidelines recommend a biopsychosocial approach to care.^{[2, 4]}

Supportive care that addresses stress, sleep and comfort between episodes is therefore reasonable, as long as medical treatment stays in place.

Migraine and nervous system sensitivity

Many people with CVS have a migraine-like pattern. A unifying idea is that nerve cells are over-excitable and that the brain's control of autonomic signals is altered.^[3] Most patients respond to migraine-focused treatment strategies.^[3]

Stress and illness as triggers

Stress and intercurrent illnesses commonly trigger episodes, so lifestyle and non-drug measures play an important role in management.^[3]

Anxiety, depression and sleep

CVS often occurs with anxiety, depression, autonomic dysfunction and sleep disorders. Guidelines advise screening for and treating them.^{[1, 4]}

Cannabis use

Many people with CVS use cannabis for relief, and long-term heavy use is also linked to cannabinoid hyperemesis syndrome, a related vomiting disorder. It is unclear whether cannabis causes it or unmasks CVS.^{[2, 6]} This is a conversation for your physician.

Acupuncture as supportive care in Cyclical Vomiting Syndrome

What the research shows

We found no clinical trials of acupuncture for cyclical vomiting syndrome itself. What exists is evidence for related symptoms, and it should not be read as proof that acupuncture works in CVS.

For nausea and vomiting from other causes, a 2023 meta-analysis of 38 trials in cancer patients found acupuncture added to usual care may improve control of acute and delayed vomiting, but the certainty of evidence was very low.^[7] In pregnancy-related nausea and vomiting, a meta-analysis of 33 trials found low-quality evidence that acupuncture beat conventional medicine on response rate.^[8]

Because CVS is closely related to migraine, acupuncture for migraine prevention is relevant. A meta-analysis of 14 trials found acupuncture reduced migraine frequency compared with sham and with medication, but the evidence quality was low to very low and the authors called its effectiveness uncertain.^[9] A systematic review of seven trials comparing acupuncture with standard preventive drugs found some trials favored acupuncture, though differences between studies prevented pooling.^[10] For another stomach problem, delayed stomach emptying, a Cochrane review found very low-certainty evidence of short-term benefit and no difference from sham in one trial.^[11]

How acupuncture may work

We could not find a source that shows how acupuncture would work in CVS, so we make no claim about a mechanism for this condition.

What treatment involves

Treatment uses fine, sterile, single-use needles, usually left in place for about 20 to 40 minutes. A course of several visits is followed by reassessment. During an acute episode with repeated vomiting, you need medical care and hydration, not an acupuncture appointment.

Serious problems are rare. In prospective studies, about 9 in 100 patients had a minor reaction such as bleeding, soreness or redness at a needle site, and serious events occurred in about 1 in 10,000 patients.^[12] Tell the practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker, which matters for electroacupuncture.

Ayurvedic medicine as supportive care in Cyclical Vomiting Syndrome

The Ayurvedic view

Ayurveda describes recurrent vomiting under the heading of Chhardi, often linked to disturbed Pitta or Kapha and weak digestion (agni). These are traditional categories, not biomedical diagnoses.

Therapies that may be used

Care is chosen for the individual and, in CVS, is limited to gentle measures between episodes:

• Regular meal times and a steady sleep and daily routine, since stress and intercurrent illness commonly trigger episodes and lifestyle measures matter in management^[3]
• Stress-reducing practices such as breathing exercises, meditation and gentle movement, which guidelines say may be offered as complementary therapy^[4]
• Individually prescribed herbs for digestion, only after review of your medicines

Panchakarma procedures, particularly induced vomiting or purgation, are not appropriate for people with recurrent vomiting, in pregnancy, in acute illness or frailty, or during an episode. We do not use them for CVS.

What the research shows

We found no clinical trials or systematic reviews of Ayurvedic treatment for cyclical vomiting syndrome. Any Ayurvedic care here rests on tradition and general supportive aims such as routine and relaxation, not on trial evidence for the condition.

Herbal medicine as supportive care in Cyclical Vomiting Syndrome

Herbs and formulas that have been studied

No herbs have been tested in clinical trials for cyclical vomiting syndrome. Ginger is the herb most studied for nausea and vomiting from other causes.^{[13, 14]}

What the research shows

In pregnancy, a meta-analysis of 12 trials found ginger improved nausea compared with placebo but did not significantly reduce vomiting episodes, with low-quality evidence.^[13] In chemotherapy-related nausea, a meta-analysis of 35 trials (22 of them of ginger capsules) found ginger capsules used with standard antiemetics reduced severe nausea and vomiting, and called for more rigorous trials.^[14] Whether this applies to CVS is not known.

Safety and herb-drug interactions

Herbs are active substances. A systematic review lists ginger among herbs and supplements linked to increased bleeding risk with warfarin.^[15] Tell us about all medicines, especially blood thinners, and also about the tricyclic antidepressants and migraine medicines that are often used in CVS, since herb-drug interactions are best reviewed individually.

In one study, about one fifth of Ayurvedic products bought online contained detectable lead, mercury or arsenic.^[16] Herbs should come from tested sources and be prescribed individually. Tell us if you are pregnant or breastfeeding, or have liver or kidney disease. Herbs do not replace rehydration or anti-nausea medicines during an episode.

Translating traditional medicine into modern biological language

The links drawn here are interpretation, not equivalence. Chinese medicine often describes recurrent vomiting as stomach qi rising against its normal downward direction, sometimes with liver qi stagnation. Researchers might compare this loosely with disordered gut-brain and autonomic signaling, which is how CVS is currently understood.^{[1, 3]}

Ayurveda's disturbed Pitta or Kapha and weak agni describe nausea and sluggish digestion. No study has shown that a dosha corresponds to a specific biological process.

How this care fits with your medical care

Cyclical vomiting syndrome needs medical diagnosis and treatment. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care. Our role is supportive: stress, sleep, comfort and well-being between episodes.

Do not stop or change preventive or rescue medicines without your prescriber. Please bring your diagnosis, any endoscopy or imaging results, your medicine and supplement list, any written emergency plan from your physician, and a note of what tends to trigger your episodes.

When to seek urgent medical care

Repeated vomiting can cause dehydration and other complications, and some symptoms suggest a different serious problem.^[2]

• Vomiting that will not stop, or being unable to keep down any fluids
• Dizziness, fainting, very little urine, or a very fast heartbeat
• Severe or worsening abdominal pain, or a swollen abdomen
• Vomiting blood or material that looks like coffee grounds
• Sudden severe headache, confusion, weakness or trouble speaking
• Vomiting during pregnancy that is severe or does not stop

If you have any of these, call 911 or go to the nearest emergency department.