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→Signs and symptoms: Added some info about the psychological compulsion to be in hot water.
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Episodes may happen every few days, every few weeks or every few months, for some happening at common uniform times, typically mornings.<ref name="Bhandari_2018" /> For other sufferers, there is not a pattern in time that can be recognized. Some sufferers have a warning of an episodic attack; they may experience a [[prodrome]], some documented prodromal symptoms include: unusually intense nausea and [[pallor]], excess salivation, sweating, flushing, rapid/irregular heartbeat, diarrhea, anxiety/panic, food aversion, restlessness/insomnia, irritability, depersonalization, fatigue/listlessness, intense feelings of being hot or chilled, intense thirst, shivering/shaking, retching, tachypnea, abdominal pain/cramping, limb paresthesias, hyperesthesia, photophobia, phonophobia, headache, and dyspnea, heightened sensitivity, especially to light, though sensitivity to smell, sound, pressure, and temperature, as well as oncoming muscle pain and fatigue, are also reported by some patients. Some prodromal symptoms are present inter-episodically as well as during acute phases of illness. The majority of sufferers can identify triggers that may precede an attack. The most common are various foods, [[infection]]s (e.g., [[colds]]), menstruation, extreme physical exertion, lack of sleep, and psychological [[stress (biological)|stress]]es, both positive and negative.{{citation needed|date=May 2020}}
A sufferer may also be light-sensitive ([[photophobia|photophobic]]), sound-sensitive ([[phonophobia|phonophobic]]) or, less frequently, temperature- or pressure-sensitive during an attack.<ref name="Lindley 2005">{{cite journal|vauthors=Lindley KJ, Andrews PL|s2cid=25060114|date=September 2005|title=Pathogenesis and treatment of cyclical vomiting|journal=Journal of Pediatric Gastroenterology and Nutrition|volume=41 Suppl 1|issue=Suppl 1|pages=S38-40|doi=10.1097/01.scs.0000180299.04731.cb|pmid=16131963}}</ref> Some sufferers also have a strong urge to bathe in warm or cold water. In fact, many people who suffer from CVS experience a compolsion to be submerged in hot water, and end up taking several baths during the duration of an episode. For some the psychological compolsion to be in hot water is so extreme that they cannot stop themselves from taking very long baths in near scalding hot water several times per day. For some of these people, they may have just finished taking a lengthy bath is extremely hit water and immediately feel this compulsion again and end up taking another bath right after drying off. Some sufferers experience [[insomnia]], diarrhea (GI complications), hot and cold flashes, and excessive sweating before an episode. Some sufferers report that they experience a restless sensation or stinging pain along the spine, hands, and feet followed by weakness in both legs. Some of these symptoms may be due to dehydration or [[hypokalemia]] from excessive vomiting, rather than the underlying cause of CVS.
==Genetics==
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