Irregular Periods
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Try one of these related symptoms.
Irregular periods
Absent periods
Menstrual delay
Two periods in one month
Periods occurring more frequently than 24 days
Periods occurring too frequently
Menstrual disorder
Menstruation has not occured
No periods for the past few months
Menstruation stopped
Infrequent periods (fewer than 6-8 a year)
Late period
About the Symptom
Irregular periods mean that the timing of them is irregular and unpredictable. The normal length of the menstrual cycle is typically between 21 and 35 days. A normal menstrual period generally lasts up to 7 days. If the time between periods varies significantly, then it is considered abnormal.
When to See a Doctor
Seek professional care if you experience any of the following symptoms
- sweating
- Recent weight loss
- Edema
- Altered mental status (delirium)
- Muscle weakness in the limbs
Possible Causes
Generally, Irregular periods can be related to:
- Primary Amenorrhea
A condition where menarche (first period for a girl) does not occur on time. Typically absence of first period by age 15 is considered abnormal, but this does vary by ethnicity and location. Causes include problems with malnutrition, genetic disorders, formation of the reproductive system and hormonal imbalances. Primary amenorrhea typically needs evaluation with a specialist to find the correct diagnosis and treatment.
- Anovulatory Menstruation
A condition where menstruation does not occur regularly due to the failure of an egg to be released from the ovaries. This causes irregular menstruation with skipped months, and can be heavy in nature. The failure of ovulation (egg release) can be caused by hormonal imbalances, being overweight or extremely underweight, thyroid disorders and uncontrolled diabetes to name a few examples.
- Menopause
A normal condition where menstrual periods stop due to decreasing levels of hormones from the ovaries. Menopause marks the end of the reproductive age for the women. The average age of menopause in the United States is 51 years. Menopause is abnormal if it occurs too early (under 40 years old). While menopause is normal, many women suffer from hot flashes, sleep disturbances and other symptoms that can be disruptive to their enjoyment of life when entering menopause.
- Turner Syndrome
- Pregnancy
- Uterine Hypoplasia
- Polycystic Ovarian Syndrome (PCOS)
- Uterine Cancer
- Luteal Insufficiency
- Asherman Syndrome
Doctor's Diagnostic Questions
Your doctor may ask these questions to check for this symptom:
- Are your periods irregular?
- When did you first notice your irregular periods?
- Is your menstrual cycle infrequent?
- Have you previously experienced irregular menstrual cycles?
- Which of the following best describes your irregular menstrual periods?
Reviewed By:
Ravi P. Chokshi, MD (Obstetrics and Gynecology (OBGYN), Critical Care)
Current Maternal Fetal Medicine Fellow with Dual board certification in Obstetrics & Gynecology and Critical Care Medicine. | 5+ years experience managing a general Ob/Gyn practice and working in the Intensive Care Unit. | Previously Physician Lead of a large single specialty practice with 8 Physicians and 10+ Advanced practitioners. | Member of the Society of Maternal Fetal Medicine Patient education committee. | Frequent Medscape Consult contributor.
Seiji Kanazawa, MD, PHD (Obstetrics and Gynecology (OBGYN))
Dr. Kanazawa graduated from the Niigata University Faculty of Medicine and received his Ph.D. from the Tohoku University Graduate School of Medicine. He is working on the front line of the General Perinatal Center, including the Tokyo Tama General Medical Center and the National Center for Research in Fertility Medicine, where he provides maternal and fetal care and undertakes clinical research. At Ubie, Dr. Kanazawa has been designing the Ubie AI Symptom Checker and has taken on the role of general obstetrics and gynecology consultation at FMC Tokyo Clinic by providing fetal ultrasound and prenatal consultation.
Content updated on Feb 6, 2025
Following the Medical Content Editorial Policy
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- Absent menstruation
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- Infrequent menstrual periods
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Link to full study:
https://www.medrxiv.org/content/10.1101/2024.08.29.24312810v1References
Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital Sign
https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2015/12/menstruation-in-girls-and-adolescents-using-the-menstrual-cycle-as-a-vital-signACOG Patient FAQ - AUB
https://www.acog.org/womens-health/faqs/abnormal-uterine-bleedingACOG Patient FAQ - Heavy and abnormal periods
https://www.acog.org/womens-health/faqs/heavy-and-abnormal-periodsDiagnosis of Abnormal Uterine Bleeding in Reproductive-Aged Women
https://www.acog.org/clinical/clinical-guidance/practice-bulletin/articles/2012/07/diagnosis-of-abnormal-uterine-bleeding-in-reproductive-aged-women