Some the common responsible factors for irregular periods, among them are:

• Significant weight gain or loss
• Over-exercise
• Breastfeeding
• Polycystic ovarian syndrome/estrogen dominance
• Poor nutrition (or a diet too high in carbohydrates)
• Medications
• Chemotherapy
• Smoking
• Drug use
• Caffeine
• Eating disorders
• Increased stress
• Hormonal imbalance related to perimenopause
• Recent childbirth, miscarriage, or D&C
• Excessive alcohol use (interfering with how the liver metabolizes estrogen and progesterone)
• Uterine abnormalities (fibroids/cysts/polyps/endometriosis)"
  
  

If you are suffering from irregular menstrual cycle then you need to see your physician for further treatment. The occasional missed menses cycle is not the only sign of medical problem. Continues irregular in your period is an indication of irregular ovulation. If your cycle is irregular then you need to evaluate by your doctor.

Do not get tense about slight change or variation in your period. More than 50 percent of healthy women have the problem of irregular menses. But if you are consistently irregular, may result in misleading information about your fertility. Consult your physician for healthy menses cycle.