Prostate cancer tends to develop in older men and often has no noticeable symptoms. Learn more about this disease, the second most commonly diagnosed cancer in men. Dehydration: Dehydration, loss of water from the body; it is almost invariably associated with some loss of salt (sodium chloride) as well. The treatment of any form of dehydration, therefore, requires not only the replacement of the water lost from the body but also the restoration of the normal concentration. Is this your child's symptom? Diarrhea is the sudden increase in the number and looseness of stools; Diarrhea means 2 or more watery or very loose stools.