A surprise period is one thing but bleeding unexpectedly in the middle of your cycle is different. Your menstrual cycle can vary. Usually, it lasts about 21 to 35 days but this can differ from person to person and month to month. If you notice bleeding or spotting outside your usual period, it’s normal to wonder what’s going on.
“Any vaginal bleeding between regular periods is called intermenstrual bleeding or abnormal uterine bleeding,” said Jessica Leibhart, DO, an OB-GYN with Banner Health. “It can be just a few spots of blood, brown discharge, or sometimes feel like a light period.”
While spotting between periods can happen, don’t ignore it, especially if it’s new, happens often, or comes with other symptoms. Keep reading to learn what this bleeding might mean, when you should see a doctor and when it might need urgent care.
What counts as bleeding between periods?
“Bleeding typically requires the use of menstrual products, while spotting does not,” Dr. Leibhart said. “Spotting is usually light, often just a few drops and may only show up when you wipe or on underwear.”
Here is a quick guide:
Spotting
- Very light flow
- Pink, red or brown in color
- Does not require pads or tampons
- Often short-lived (hours to one or two days)
Bleeding between periods
- Heavier bleeding or flow
- May require pads or tampons
- Can last several days
Common causes of bleeding between periods
Spotting in the middle of your cycle can happen for many reasons. Some causes are harmless and temporary, while others may require medical attention or treatment.
Ovulation
Ovulation spotting affects about 5% of people who have periods and is usually nothing to worry about.
“Light spotting can happen from a drop in estrogen levels right after ovulation,” Dr. Leibhart said. “This sudden change in hormone levels can cause a small part of the uterine lining to shed, resulting in light spotting.”
Hormonal birth control
Spotting is common during the first few months on the pill, patch, ring or hormonal IUD.
“Your body is adjusting to new hormone levels and the uterine lining may shed some blood as it gets used to this," explained Dr. Leibhart.
Certain contraceptives are more likely to cause abnormal bleeding:
- Birth control pills: Missing one or two doses can lead to spotting or bleeding
- Copper IUDs: May increase blood flow
- Progesterone IUDs: May cause less bleeding or missed periods
If you are on birth control and experience heavy spotting or if it lasts more than a week or continues beyond three months, see your health care provider. Do not stop your birth control without talking to your provider, especially if you are using it to prevent pregnancy or manage health symptoms.
Pregnancy
Some people notice spotting early in pregnancy. This can happen when the fertilized egg attaches to the lining of the uterus and starts to grow. Usually, this is not a cause of concern but it’s important to tell your doctor.
Bleeding can also happen if you have an ectopic pregnancy. This occurs when the egg and sperm attach outside the uterus, often in the fallopian tube. It can cause bleeding and pain.
An ectopic pregnancy is a serious medical emergency. If you experience vaginal bleeding, severe pelvic pain, dizziness or fainting, seek help right away.
Infections
Some infections can irritate the cervix or reproductive organs and cause bleeding. Other signs include pelvic pain, discharge, odor, burning when urinating and fever.
Possible causes are:
- Sexually transmitted infections (STIs)
- Cervicitis, which is inflammation of the cervix
- Pelvic inflammatory disease (PID)
Fibroids and polyps
Growths in or around the uterus can sometimes lead to abnormal bleeding. Uterine fibroids are noncancerous growths made of muscle tissue. Polyps are small growths that develop in the lining of the uterus or cervix.
Both can cause:
- Spotting between periods
- Heavier menstrual bleeding
- Longer periods
- Pelvic pressure or discomfort
PMOS (formerly known as PCOS)
Polyendocrine metabolic ovarian syndrome (PMOS), once called polycystic ovary syndrome (PCOS), can affect hormone levels and ovulation. It may cause irregular periods, skipped periods and spotting between periods.
Perimenopause
The years before menopause often have big changes in hormones. Your body starts making less estrogen. This can cause your periods to become irregular. Your cycles might be shorter, longer, heavier or lighter.
Less common causes
Other conditions can sometimes cause intermenstrual bleeding, including:
- Thyroid disorders
- Bleeding disorders
- Certain medications, including blood thinners
- Extreme stress
- Endometrial hyperplasia
- Gynecologic cancers
Cancer is not the most common reason for spotting between periods. But unexplained or postmenopausal bleeding should always be checked.
What about bleeding after sex?
Dr. Leibhart said that painless bleeding after sexual intercourse can happen, especially after vigorous activity.
Other possible causes include:
- Vaginal dryness
- Infections
- Cervical polyps
- Hormonal changes
- Other gynecologic conditions
A single episode may not be serious but bleeding after sex that is new, recurring or unexplained should be checked out. See your health care provider or a Banner Health specialist.
Warning signs you shouldn’t ignore
See your provider if you notice:
- Bleeding that soaks through a pad or tampon every hour
- Spotting that lasts more than two to three days and keeps coming back
- Bleeding after sex
- Spotting or bleeding after menopause
- Bleeding with pelvic pain, cramping or unusual vaginal discharge
- Bleeding while pregnant
These signs don’t always mean something serious but they are your body's way of telling you something is wrong. Finding issues like infections, polyps or hormonal problems early makes them easier to treat.
How is it diagnosed?
When you see your provider about bleeding between periods, they’ll usually ask a few questions: When did it start? How heavy is the bleeding? Are you taking any medications? They might also recommend one or more of these tests:
- Pelvic exam: To check for signs of infection, polyps, or other issues
- Pregnancy test: To see if you might be pregnant
- Blood tests: To check hormone levels, thyroid health or pregnancy signs
- STI test: Since infections are a common and treatable cause
- Pelvic ultrasound: To look for fibroids, polyps or ovarian cysts
- Endometrial biopsy: Sometimes a small sample of the uterine lining is taken to check for cancer
How is bleeding between periods treated?
Treatment depends entirely on the cause. Your provider may recommend:
- Observation and monitoring
- Hormonal birth control adjustments
- Treatment for infections
- Medications to manage bleeding
- Treatment for thyroid disorders or PMOS
- Procedures to remove polyps or fibroids
- Other cause-specific treatments
What you can do right now
You don’t have to wait and wonder. Instead, try these simple steps:
- Keep track: Write down the date, how heavy it is, its color and any other symptoms like pain or discharge. This helps your doctor.
- Check your medicines: If you recently started a new birth control or hormone medicine, that might be causing the problem.
- Reduce stress: If your life has been busy, stress might affect your cycle.
- Don’t ignore it: If it happens once, watch for it. If it happens twice or more, see your doctor.
Bottom line
Bleeding or spotting between periods is common and can happen for many reasons. If it’s only once, it’s usually not worrisome. However, if it happens repeatedly, without a clear cause or if the bleeding is heavy, you should see a health care provider. Bleeding after sex, during pregnancy or after menopause also needs checking.
If you notice bleeding between periods, you don’t have to figure it out on your own. A women’s health provider at Banner Health can review your symptoms, do the necessary tests and help you find the right treatment.
Frequently asked questions about bleeding between periods
Why am I bleeding between periods?
Bleeding between periods can be caused by ovulation, hormonal changes, birth control, pregnancy, infections, fibroids, polyps, perimenopause, medications or other health conditions.
Is spotting between periods normal?
Sometimes. Light spotting can happen with ovulation or after starting hormonal birth control. But spotting that keeps happening, gets heavier or comes with pain should be checked.
Can stress cause bleeding between periods?
Yes. Stress can affect hormones and menstrual cycles, which may contribute to irregular bleeding. But do not assume stress is the cause if bleeding is new, heavy or recurring.
Can birth control cause spotting?
Yes. Hormonal birth control can cause breakthrough bleeding, especially when starting a new method or missing doses. Talk to your provider if bleeding is heavy, painful or ongoing.
Can bleeding between periods mean pregnancy?
Yes, it can. If pregnancy is possible, take a pregnancy test. Seek urgent care for bleeding with severe pelvic pain, dizziness, fainting or shoulder pain.
What does brown spotting between periods mean?
Brown spotting is often old blood leaving the body. It can happen before or after a period, with ovulation, with birth control changes or for other reasons. Recurring or unexplained brown spotting should be checked.
Should I worry about bleeding after sex?
Bleeding after sex can happen from dryness or irritation but it can also be linked to infection, cervical polyps or other changes. If it happens more than once, talk with a provider.
Is bleeding after menopause normal?
No. Any bleeding after menopause should be evaluated by a health care provider.
