Symptoms

Sudden onset of watery diarrhea, up to 1 liter (quart) per hour

Diarrhea has a "rice water" appearance -- the stool looks like water with flecks of rice in it

Diarrhea has a "fishy" odor

Dehydration can occur rapidly

Rapid pulse (heart rate)

Dry skin

Dry mucous membranes or dry mouth

Excessive thirst

Glassy eyes or sunken eyes

Lack of tears

Lethargy

Unusual sleepiness or tiredness

Low urine output

Sunken "soft spots" (fontanelles) in infants

Abdominal cramps

Nausea

Vomiting