Dehydration from diarrhea usually recovers in about 2 to 3 days, and it takes about 7 days to recover from severe symptoms. If diarrhea leads to dehydration, it needs to be treated with rehydration fluids under the guidance of a professional doctor. Usually patients with mild dehydration symptoms can recover in about 2 to 3 days after timely treatment. If diarrhea leads to severe dehydration, this time is more serious, there may be stubborn low blood pressure or multi-organ failure, and even life-threatening, need to standardize the treatment, about 7 days to recover. Therefore, once diarrhea leads to dehydration, it is recommended to go to the hospital as soon as possible for consultation and treatment to avoid further aggravation of the symptoms of diarrhea. Meanwhile, during the period of diarrhea, the diet must be kept light, do not eat greasy or spicy stimulating food, to avoid the gastrointestinal stimulation, which is not conducive to the recovery of the condition.