Nausea and Vomiting

Nausea is the sensation of feeling sick to your stomach, as if you are going to throw up. Vomiting (also called emesis) is the act of forcefully expelling the contents of the stomach through the mouth. According to MedlinePlus, a service of the National Library of Medicine, nausea and vomiting are common symptoms that can be caused by many different conditions.

Common causes include gastroenteritis (infection of the intestines), food poisoning, motion sickness, migraines, pregnancy-related morning sickness, medications (particularly chemotherapy), gastroesophageal reflux disease (GERD), peptic ulcers, and intestinal obstruction. Nausea and vomiting may also occur as a reaction to pain, emotional distress, or as a symptom of systemic conditions such as infections, metabolic disorders, or neurological conditions.

The vomiting reflex is coordinated by the vomiting center in the brainstem, which receives input from multiple sources including the digestive tract (via the vagus nerve), the inner ear (motion sickness), the chemoreceptor trigger zone (which detects toxins and medications in the blood), and higher brain centers (emotions, smells, memories). Understanding the cause of nausea and vomiting is essential for appropriate management, as treatment varies depending on the underlying trigger.

This is an educational description of traditional TCM frameworks. It is not a diagnosis or individualized treatment recommendation.

In Traditional Chinese Medicine, nausea and vomiting are typically understood as manifestations of rebellious stomach qi (胃气上逆). In healthy function, stomach qi moves downward to receive and process food. When this normal directional flow is disrupted, stomach contents move upward, producing nausea, vomiting, and retching.

Several traditional pattern frameworks are commonly discussed in TCM literature for nausea and vomiting presentations:

• Cold-Dampness obstructing the Spleen and Stomach— External cold or internal dampness impairs the Spleen's transformation function and the Stomach's descending function. This may present with nausea, vomiting of clear fluids, a sensation of fullness in the chest and epigastrium, preference for warm drinks, and fatigue.
• Food Accumulation and Stagnation — Overeating or consuming difficult-to-digest foods causes food to stagnate in the Stomach, obstructing the normal flow of qi. Symptoms may include nausea, vomiting of undigested food, foul-smelling breath, abdominal distension, and aversion to food.
• Liver Qi Stagnation invading the Stomach — Emotional stress, frustration, or anger cause Liver Qi to stagnate and rebel upward into the Stomach, disrupting its descending function. This pattern is often associated with nausea or vomiting triggered by emotional upset, accompanied by rib-side distension, sighing, and irritability.
• Stomach Heat or Liver-Stomach Heat — Excessive heat in the Stomach or heat transferred from the Liver forces stomach qi upward. This may present with nausea, vomiting of sour or bitter fluids, thirst, preference for cold drinks, and a burning sensation in the epigastrium.
• Spleen-Stomach Deficiency — Chronic weakness of the Spleen and Stomach impairs their ability to transform food and move qi downward. This pattern may present with frequent nausea, vomiting of small amounts, fatigue, poor appetite, and loose stools.

TCM formulations traditionally discussed for nausea and vomiting include Xiang Sha Liu Jun Zi Tang (for Spleen-Stomach deficiency with qi stagnation), Ban Xia Xie Xin Tang (for mixed cold-heat patterns with epigastric fullness and nausea), and Wen Dan Tang (for phlegm-heat disturbing the Stomach). Single herbs frequently mentioned include Sheng Jiang (fresh ginger) for cold-type nausea and vomiting, and Ban Xia (Pinellia) for phlegm-dampness patterns. These descriptions reflect traditional frameworks and do not constitute evidence-based treatment recommendations.

Research on complementary approaches for nausea and vomiting has focused primarily on ginger, acupuncture, and acupressure. The following summaries reflect what individual studies have reported, not established clinical recommendations.

Ginger for Postoperative Nausea and Vomiting (Meta-Analysis)

A 2006 meta-analysis by Chaiyakunapruk et al., published in American Journal of Obstetrics & Gynecology, pooled five randomized controlled trials with 363 patients to evaluate ginger for the prevention of postoperative nausea and vomiting. The analysis reported that a fixed dose of at least 1 gram of ginger was more effective than placebo, with a summary relative risk of 0.69 for postoperative nausea and vomiting (95% CI 0.54-0.89) and 0.61 for postoperative vomiting (95% CI 0.45-0.84). Only one side effect, abdominal discomfort, was reported. However, the authors noted that the number of included trials was small and further well-designed studies were needed.

Acupuncture-Point Stimulation for Chemotherapy-Induced Nausea and Vomiting (Cochrane Review)

A 2006 Cochrane systematic review by Ezzo et al. evaluated acupuncture-point stimulation (including acupuncture, electroacupuncture, and acupressure at the P6 point) for chemotherapy-induced nausea and vomiting. The review included 11 randomized trials and reported that P6 stimulation appeared to reduce the incidence of acute chemotherapy-induced vomiting, but the evidence for nausea was less clear. The review also noted significant methodological limitations in the included trials, including inadequate blinding, small sample sizes, and variation in acupuncture techniques and point selection.

Interventions for Chemotherapy-Induced Nausea and Vomiting (Systematic Review)

A 2022 systematic review and meta-analysis by Patel et al., published in Supportive Care in Cancer, evaluated 295 randomized trials with 65,172 citations to assess interventions for preventing acute-phase chemotherapy-induced nausea and vomiting. The review focused primarily on pharmacological interventions (olanzapine, neurokinin-1 receptor antagonists, palonosetron) and reported that combination antiemetic regimens improved control of nausea and vomiting. The review did not systematically evaluate TCM interventions, highlighting the need for TCM-specific trials to be evaluated within the context of standard antiemetic care.

Overall Evidence Limitations

The existing research on TCM approaches for nausea and vomiting has several consistent limitations: studies on ginger have focused mainly on postoperative and pregnancy-related nausea, with limited data for other causes; acupuncture trials vary considerably in technique, point selection, and frequency of treatment; many studies are small and conducted at single centers; blinding is challenging in acupuncture and herbal medicine trials; and few studies compare TCM interventions against current standard antiemetic medications in adequately powered trials. As a result, the evidence does not establish a standard TCM treatment recommendation for nausea and vomiting, and TCM should not replace conventional medical evaluation and management.

The following symptoms require prompt conventional medical evaluation and should not be managed with self-care or herbal products alone:

• Vomiting blood or material that looks like coffee grounds
• Black or tarry stools (melena)
• Signs of dehydration: dry mouth, infrequent urination, dark urine, dizziness
• Severe or worsening abdominal pain
• Chest pain
• Severe headache, stiff neck, confusion, or fainting
• Persistent vomiting lasting longer than 24 hours
• Inability to keep fluids down
• Vomiting accompanied by high fever

Pregnancy: Nausea and vomiting during pregnancy (morning sickness) are common, but severe or persistent symptoms (hyperemesis gravidarum) require medical evaluation. Pregnant individuals should consult their obstetric provider before using any herbal products, as some herbs traditionally used for nausea have limited safety data during pregnancy.

Infants and children: Vomiting in infants and children requires careful evaluation. Young children can become dehydrated quickly. Do not give herbal products to infants or children without pediatric guidance.

Older adults: Older adults are at increased risk of dehydration and electrolyte disturbances from vomiting. Medical evaluation is important to identify underlying causes such as medication side effects, infections, or bowel obstruction.

People with chronic illness: Individuals with diabetes, kidney disease, heart conditions, or those taking multiple medications should seek medical evaluation for persistent nausea or vomiting, as these symptoms may indicate serious complications or drug interactions.

Medication interactions: Individuals taking antiemetic medications, chemotherapy, or other prescription drugs should not add herbal products without consulting a qualified healthcare provider, as interactions may occur.