Classic “rice water” diarrhea with fishy odor; usually painless
Fluid losses can be significant, up to 1L/hr, leading to severe fluid and electrolyte abnormalities.  However, most cases are mild.
Occasionally seen: sudden watery vomiting, borborygmi, abdominal cramping.
Later manifestations:
Dehydration] may lead to → sunken eyes, dry mouth, cold clammy skin, decreased skin turgor, or wrinkled hands and feet (also known as “washer woman’s hands”)
Acidosis from loss of bicarbonate
Muscle cramps from hypokalemia, hypocalcemia
Death
Arrhythmia from electrolyte imbalance
Brain damage from prolonged hypoglycemia and failure of gluconeogenesis
Aspiration pneumonia
Paralytic ileus
Cholera
Viral 
Traveler's diarrhea
Bacterial
Malaria
Campylobacter
Schistosomiasis
Shigella