Take note of the frequency and severity of the symptoms your mentee is exhibiting.
If this is a formal mentor relationship (within a structured program), consult with your program director. The program director may be able to obtain existing medical information (with parental consent) that may allow you to appropriately adapt to any existing medical conditions
If this is an informal mentoring relationship, contact other helping professionals: school nurse, guidance counselor etc for advice. Through these professionals you may be able to provide information to the mentee about options for medical services he/she can seek on his own, such as substance abuse or family planning services, mental health services, or HIV testing.