While occasional changes in the menstrual cycle are not unusual, frequently experiencing two periods in a month may indicate an underlying issue.
Six possible causes
Possible causes of having two periods in 1 month include:
1. One-time anomaly
Having two periods in a month is not always a sign of a problem.
A person may occasionally have a shorter menstrual cycle that includes two periods in a month.
Following this, their periods may return to their regular cycle.
This occasional change is why doctors look for consistent patterns of frequent bleeding before making a diagnosis or suggesting treatments unless there is an infection or more serious issue present.
2. Young age
Irregular menstrual cycles are common in young people who have just started to have periods.
People tend to have shorter or sometimes longer menstrual cycles during puberty, which may lead to them having two periods in 1 month.
Hormone levels fluctuate significantly during puberty. Research suggests that a young person’s menstrual cycle can take around 6 years to become regular from the time they start having periods.
Endometriosis is a condition where tissue that is similar to uterine tissue grows in other areas of the body.
Endometriosis can cause abdominal pain, abnormal cramping, and irregular bleeding. Sometimes, bleeding can be heavy enough to seem like another period.
A doctor can, in some circumstances, diagnose endometriosis using a pelvic exam and ultrasounds.
However, a minor surgery called laparoscopy is the only definitive way to diagnose the condition.
Everything you need to know about breakthrough bleeding
Learn more about breakthrough bleeding or spotting, which is bleeding that occurs between periods.
Perimenopause refers to the years leading up to menopause when a person’s hormones start to change.
Perimenopause may last up to 10 years. During that time, people often experience irregular menstrual cycles, including having shorter or longer cycles, skipping periods, or experiencing heavier or lighter bleeding.
When someone has had no periods for 12 consecutive months, they are in menopause.
5. Thyroid problems
Thyroid problems may cause changes to periods.
The thyroid is a regulator of hormonal processes in the body.
This small, butterfly-shaped gland sits just in front of the throat and controls functions, such as body temperature and metabolism.
Irregular menstrual cycles are a common symptom associated with thyroid problems. This is true in both underactive thyroid or hypothyroidism and overactive thyroid or hyperthyroidism.
According to the U.S. Department of Health & Human Services, an estimated one in eight women will experience thyroid problems in their lifetime.
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Symptoms of hypothyroidism include:
always feeling cold
feeling tired all the time
heavy menstrual bleeding
slow heart rate
unexplained weight gain
Symptoms of hyperthyroidism include:
always feeling hot
bulging of the eyes
diarrhea or frequent bowel movements
rapid heart rate
unexplained weight loss
Both conditions are treatable, so people should see a doctor if they think they may have a thyroid condition.
6. Uterine fibroids
Uterine fibroids are growths that occur in the uterus. Fibroids are usually not cancerous but can cause bleeding, especially heavy menstrual bleeding.
Additional symptoms of fibroids can include:
feelings of fullness or pressure in the pelvis
low back pain
pain during sex
While doctors do not know what causes uterine fibroids to develop, they do know that they tend to run in families, and changes in hormone levels can affect them.
Doctors can often diagnose the condition by conducting a pelvic examination or performing imaging studies, such as an ultrasound.
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When to see a doctor
Discuss frequent or heavy periods with a doctor.
If someone has two periods a month over the course of 2 to 3 months, they should see a doctor.
People should also speak to a doctor about heavy bleeding, such as passing blood clots that are the size of a quarter or larger or bleeding through one or more pads or tampons every hour.
Other period symptoms a person should talk to a doctor about include:
pain or bleeding during intercourse
shortness of breath
unexplained weight changes, including weight gain or loss
Frequent periods can indicate an underlying condition that requires treatment.
Having too many periods can also result in blood loss that leads to anemia or low blood counts, so it is essential to seek medical advice.