Vomiting occurs when the contractions of stomach muscle walls cause a large amount of stomach contents to push upward and flow back into the esophagus, exiting through the mouth (or nose). Since the food is traveling upward, some of the foods and liquids will involuntarily flow back into the mouth [1]-[3]. Vomiting or spitting up food is very common among infants and not too worrying of an issue. However, vomiting can be dangerous if it causes loss of a lot of fluids, leading to dehydration in the baby [2]-[4]. If the baby vomits immediately after eating, it may reflect a more serious problem. Reflux occurs when the muscles between the esophagus and the stomach do not work properly and thus the contents of the stomach flow back into the pharynx [5]. Vomiting can be caused many various factors, including viral or bacterial infection, stomach infections, urinary tract infections, pneumonia, meningitis, strep throat, and even ear infections. Crying, toxic substances, and intestinal obstruction are also other factors which may cause vomiting [4][5].

In spite of significant progress in the prevention and treatment of nausea and vomiting, their effective management is still a major problem. It should be noted that severe vomiting can lead to development of many complications, such as dehydration, weight loss, fluid- electrolyte imbalance, anorexia, esophageal tears, weakness, wound dehiscence, fractures, pre- renal azotemia, or decline in behavioral and mental status [6]. The adverse effects of vomiting can deteriorate the patient’s self-care, physical and mental status, as well as functional abilities. This can increase the patient’s anxiety and dissatisfaction with the hospital experience, which in turn can contribute to future anticipatory nausea [7].

Prevention and treatment of vomiting by safe remedies are, therefore, essential. Complementary therapies have been widely used worldwide; moreC than 80% of the world’s population rely on complementary and alternative therapies for their health care [8]-[10]. Currently, people all over the world, especially in developing countries, pay attention to medicinal plants [11]-[14]. These plants have been shown to be reliable in the treatment of various diseases as well as in the preparation of new medicines [15][16]. The active ingredients of these herbal remedies (drugs) are being extensively investigated due to the popularity and acceptance of herbal remedies [14][17].

In this regard, medicinal plants have been mostly used in various traditional systems and have been in use for a long time [9][18]. Traditional knowledge on the use of medicinal plants have contributed to the development of antiemetic remedies. Since the prevalence of vomiting in infants and children is high, in this review, traditional medicine and phyto-medicine for vomiting are investigated; the study herein evaluates how herbal remedies affect vomiting in children.

In the current review, articles were indexed from certain databases, including ISI, PubMed, Scopus, Islamic World Science Citation Center, Scientific Information Database, and Magiran. They were retrieved by using the search terms ‘vomiting’, ‘nausea’, ‘ulcer’, ‘medicinal plants’, and ‘traditional medicine’.

Based on the search, the results showed that several plants are used in traditional medicine to treat vomiting in all people, especially children. The following are the medicinal plants: Zingiber officinale, Mentha piperita, Cinnamomum verum, Citrus limon, Matricaria chamomilla, Lavandula angustifolia, Allium cepa, Oryza sativa, Foeniculum vulgare, Cuminum cyminum, Eugenia caryophyllata, Elettaria cardamomum, Pimpinella anisum, Ferula assa-foetida, Ocimum basilicum, and Musa sapientum Table 1 and Table 2 .

In this review article, medicinal plants used against vomiting are reported. Traditional knowledge of these plants can contribute to development of antiemetic remedies. Chronic nausea is usually multifactorial in origin. High intracranial pressure, dehydration, gastroduodenal ulcers, bowel obstruction, and metabolic abnormalities (including uremia, hyponatremia and hypercalcemia) can contribute to nausea and vomiting. Psychological parameters also can induce or exacerbate it [29]. Vomiting and nausea both are mediated and controlled through central nervous system, however, by different mechanisms. Vomiting is mediated through stimulation of a complex reflex which is coordinated through a putative true vomiting center; nausea, however, results from the stimulation of autonomic nervous system.

The vomiting center usually receives afferent stimuli through various central neurologic pathways. For example, various sensory stimuli of psychological response (e.g. taste, smell, and pain) from the limbic system are able to stimulate the chemoreceptor trigger zone (CTZ) and cause vomiting. Motion sickness, however, occurs through impulses from the labyrinthine apparatus. Endogenous biochemical and exogenous substances which accumulate during irritation, ischemia and inflammation can stimulate spinal and vagal nerves to cause nausea and vomiting. Intestinal damage or irritation also cause substantial generation and release of serotonin by the enterochromaffin cells in the enteric nervous system of serotonin, which stimulates 5HT3 receptors and causes severe vomiting [30]. The central pathway is also stimulated by substance P, which in turn stimulates the neurokinin-1 receptors and the gastrointestinal vagal afferent nerve fibers. Several other receptors such as CB1 (canabinoid-1), H1 (histamine-1), D2 (dopamine-2), D3 (dopamine-3), M3 (muscarinic-3), M5 (muscarinic-5), and GABAB (gamma amino butyric acid-B) contribute to vomiting [30][31]. Thus, medicinal plants with antiemetic activities can act through various pathways. The mechanisms of action of these plants should be investigated; the modes of actions of only some of these plants have been studied so far.

Studies have also suggested the association of oxidative stress and clinical severity of vomiting and nausea [32]. This is an important issue in the use of medicinal plants as antiemetic agents. Plants, including the medicinal plants presented in this review article, mostly have antioxidant activity [33]–[35]. Antioxidants can scavenge the free radicals and return the imbalance between antioxidant activity and oxidative stress, which are induced by various diseases [13][36][37]. Therefore, each medicinal plant should be studied not only for their mode of action but also for their ability to reduce oxidative stress. Furthermore, each medicinal plant may have its own effects on a wide range of diseases [38]-[41]. Therefore, these herbal remedies may benefit the patient (adult or child) in treating emesis as well as other diseases. Moreover, the use of these herbal remedies would be associated with lower cost and greater safety than non-herbal remedies.

Although the mechanisms of action for some of these plants have been understood, there are many other plants (reviewed in this article) whereby the mechanism of action has not been elucidated. All the plants discussed in this article are beneficial against vomiting and nausea. However, future investigations are needed to explore the most effective of these medicinal plants for use in treating nausea/vomiting in the clinic.

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Vom: Vomiting, Nau: nausea

The authors declare that they have no conflict of interest

There is no financial support for this study

All authors reviewed, commented and approved the final manuscript.