Missed period for 3 months? what can be the reason? 18 yo virgin, in college and sometimes stay up, not too stressed or anything, average 6 hrs sleep.

Missed periods : There are multiple reasons for missing a period, the most common pregnancy but if you are not sexually active there are a few hormonal issues that can cause this problem: thyroid disease, poly cystic ovarian syndrome, poor nutrition, too underweight or too overweight. Some athletes can also have this problem when they do excessive exercise. Consult with your gyn provider in order to get tested.

Missed period: You may be exercising, not eating properly or dieting been ill.All these reasons can delay your period.