A woman’s missed menstrual cycle could be caused by a multitude of reasons, including hormonal fluctuations, stress, big weight losses or intense workouts. The classic symptoms may be changes in mood, breast tenderness, and pain in the belly. It's a fact that most of the ladies have irregular periods during their adolescence. The strategy to foster this behavior is to adhere to a nutritionally rich diet, practice physical exercises regularly, and use relaxation techniques to decrease the chances of stress and anxiety. If you still feel worried or have more symptoms, I suggest you make an appointment with a gynecologist to have it solved.