It usually takes 5-7 days for patients with acute gastroenteritis to fully heal, and the specific recovery time is closely related to the individual’s physical condition, treatment measures and other factors. There are many causes of acute gastroenteritis, including viral, bacterial, parasitic and fungal infections, etc. Fever, diarrhea and vomiting are typical symptoms of such conditions. Generally, if the patient has mild symptoms, some patients can heal themselves in a short time after diet control and proper rest. However, if the patient’s discomfort is severe or persistent, the patient’s symptoms can be gradually relieved after 2-3 days of treatment and complete recovery can be achieved in about 5-7 days after completing relevant examinations and clarifying the specific causes. In conclusion, the prognosis of acute gastroenteritis is generally good, and its course is often related to the patient’s age and his or her immunity. It is recommended that the elderly and infirm, as well as those with severe symptoms, must be treated actively. Daily attention to rest, drinking more water and avoiding spicy and other stimulating foods can help promote recovery.