The most common cause of mesenteric lymphadenitis is a viral infection, such as gastroenteritis — often called stomach flu. This infection causes inflammation in the lymph nodes in the thin tissue that attaches your intestine to the back of your abdominal wall (mesentery).
Not that much serious which are fatal type.
Next Steps
almost 70% he will normal with dietary changes. rest for other you can take homoeopathic medicine for your child.
it is safe and effective.
Health Tips
avoid packet food in your child diet.
water intake is more.