The average age at onset is 3–7 years, with described cases as young as 6 days and as old as 73 years. Typical delay in diagnosis from onset of symptoms is 3 years. Females show a slight predominance over males. One study found that 3 in 100,000 five-year-olds are diagnosed with the condition. Two studies on childhood<unk>  suggest nearly 2% of school-age children may have<unk> .
Cyclic vomiting syndrome
Cannabinoid hyperemesis syndrome
Ichthyoallyeinotoxism
Geophagia
Bloom syndrome
Aerophagia
Jamaican vomiting sickness
Mallory–Weiss syndrome