Can polycystic ovaries(pcod) be areason for missed periods?

Yes: In fact, you may stop having periods altogether. One key to managing pcos / pcod is to stay aerobically / physically fit. Good luck.

Yes: It is quite common to skip periods due to pcos - the other extreme is constant bleeding.

Very common: Pcos may be present in up to 30% of women. It is a very common cause for weight gain, missed periods, infertility, hair growth, etc. It is best treated w/diet, exercise and weight loss. Metformin therapy can help restore normal menses and often fertility. Check w/your doctor.