<s>[INST] Hi my son is 6 years old he has been vomiting mostly at night or early morning for almost 2 weeks almost every night and also has diarrhea  during the day, he has appetite most of the day and doesn't complain of any pains,no fever either. What is wrong with him? [/INST] Hi...ti could be a virus which is causing this. Viruses are the most common offending agents. But as the kid is above 5 years even protozoa and bacteria can be the agents but in this case if it is protozoan origin then the vomiting won't be prominent.Unless the kid's having low urine output or very dull or excessively sleepy or blood in motion or green bilious vomiting...you need not worry. I suggest you use zinc supplements (Z&D drops 1ml once daily for 14 days) & ORS (Each small packet mixed in 200ml of potable water and keep giving sip by sip) as hydration is very important and crucial part of treatment. If there is vomiting you can use Syrup Ondansetron (as prescribed by your paediatrician).Regards - Dr. Sumanth </s>