Please my 5 years old son sometimes cries from leg...

Dear Customer
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What is the possible cause of your kid medical condition ?
in such a case , the most possible cause is : injury 
- other cuases include :
1. bad life style habits 
2. bad sleep habits 
3. low calcuim or vitamin D 
4. other hormonal medical condition 
What is the next ?
1. consult a pediatrics doctor soon 
2. do the needed medical condition such as :
- physical examination
- blood test 
- kidney function test 
- vitamin D and calcuim level 
What is the possible treatment options ?
1. changes in life style habits 
2. vitamin suppliments 
3. topical pain killers 
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Kind Regards