The cause of cyclic vomiting syndrome is unknown. However, some experts believe that some possible problems with bodily functions may contribute to the cause, such as the following: - gastrointestinal motilitythe way food moves through the digestive system - central nervous system functionincludes the brain, spinal cord, and nerves that control bodily responses - autonomic nervous system functionnerves that control internal organs such as the heart - hormone imbalanceshormones are a chemical produced in one part of the body and released into the blood to trigger or regulate particular bodily functions - in children, an abnormal inherited gene may also contribute to the condition Specific conditions or events may trigger an episode of cyclic vomiting: - emotional stress, anxiety, or panic attacksfor example, in children, common triggers of anticipatory anxiety are school exams or events, birthday parties, holidays, family conflicts, or travel - infections, such as a sinus infection, a respiratory infection, or the flu - eating certain foods, such as chocolate or cheese, or additives such as caffeine, nitritescommonly found in cured meats such as hot dogsand monosodium glutamate, also called MSG - hot weather - menstrual periods - motion sickness - overeating, fasting, or eating right before bedtime - physical exhaustion or too much exercise
What causes Cyclic Vomiting Syndrome ?