I didn't have any intercourse or sexual activity in this 1 year..i had regular periods also now i missed periods for 3 months. and no thyroid glands?

Doctor can evaluate: If not pregnant, other causes of missed periods include: excessive weight loss or gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… A visit to one’s Ob-Gyn or primary care doctor is a good idea if symptoms are persistent, recurring, or worrisome. Having no thyroid gland means lab tests are needed.