See a physician: There are many reasons as to why a young person might experience lightheadedness, which depend on the circumstances during which the symptoms occur; i.e with sudden changes in position (orthostasis), palpitations (arrhythmias), dehydration, pain and others. Given your friend's symptoms have been ongoing for a while I suggest seeing a physician for evaluation. In the meantime, keep well hydrated.
Answered 9/27/2016
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