My 13 + son is eating salt after meal why he is...

Dear Customer
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Does increasing salt intake harmful :

of course , unnesscery salt intake is harmful for body in short and long term 

Possible side effects of increased salt intake :

1. dehydration
2. porlonged vomiting 
3. sweating 
4. fevers 
5. diarrhea 
6. effects on body electrolytes and organs function such as blood , kidney , stomach and intestines 

Why does your kid have this habit :

its not really clear as that we dont know much about your kid diet and life style habit , but its possible just caused by life style and diet 

What to do next :

1. consult an pediatric doctor soon to do the needed medical examnation and assist your kid medical condition
2. medical examinations include : blood test , physical examnaition , kidney test , thyroid hormones test 
3. assure your kid drinks plenty of fluids 
4. try to replace this habit with better and healthier option such as fruits 
You can also ask our other certified experts in various fields such as: Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.
Kind Regards