My son is ten years old, very healthy and of average weight and height for his age. He had a stomache and diarrhea yesterday and today has had just occasional stomach cramps along with a fever of 102.4, and body aches especially in his shoulders, wrists and spine. Is this serious?
Hi.... by what you quote I feel that your son is going through a viral illness. Diarrhea and cramps and body aches are also suggestive of the same. To reassure you I will tell you the danger signs or Red flag signs when you need to worry - 1. Blood in motion2. Low urine output3. Extreme tiredness4.  Chat Doctor.  Sunken eyeball6. Green or bilious or continuous vomiting these are not there you need not worry about the diarrhea. But if he does not get better in another 24 hours I suggest you get him examined by a physician. Regards - 