Acute gastroenteritis is a common and frequently occurring disease during the summer and autumn seasons, because the temperature is very high during this period, making food easily spoil. Additionally, consuming cold drinks and using air conditioning can easily lead to catching a cold. Therefore, the most common causes of acute gastroenteritis are likely due to catching cold or improper diet. Abdominal pain and diarrhea are the main symptoms, and they vary slightly. If the acute gastroenteritis is caused by bacterial infection, the abdominal pain and diarrhea can be quite severe. The diarrhea can be watery, or it can be mucous-like or even dysenteric. For gastroenteric flu, the abdominal pain is generally not so severe, and the stools are mostly loose watery stools.