Hello dear
In teenage group, most common cause of headache is Refractive error.
Next Steps
*You can give any combination of Ibuprofen tablet for symptomatic relief
*Get eyesight tested
*For screen hygiene and sleep hygiene principles, consult with a General physician.
Health Tips
If you wish to have a pocket friendly consultation regarding this, I am here to help you. You can contact me directly over Text Audio Video on Practo app. Thanks and take care.