Why Bleeding or Spotting Occurs Between Periods

Know when to seek medical care

Bleeding or spotting between regular monthly periods can alarm you. When this happens, you may see just a spot or two of blood on your underwear or toilet tissue, or you may be bleeding as if you have started your period. While there are benign reasons for this symptom, it can also point to more serious problems that will need treatment.

Normal Menstrual Bleeding

Normal menstrual bleeding lasts about five to seven days. While menstruation usually occurs an average of every 28 days, anywhere from 21 to 35 days between periods is considered normal.

Most women get to know their own cycles after a few years of menstruating. Although it may seem like you are losing a lot of blood, it usually only measures between two and eight tablespoons.

About 14 days after the start of your period, you ovulate and release an egg from the ovary. Some women note spotting during ovulation, which is normal, although it should be discussed with your doctor.

The uterine lining is ready for the implantation of a fertilized egg, and there can be spotting at the time of implantation if that occurs and pregnancy begins. If no fertilized egg implants, the uterine lining is shed during menstrual bleeding approximately two weeks later. 

Causes of Irregular Bleeding

Some women may experience spotting during ovulation which is normal. Although the reasons for irregular bleeding can vary according to individual health situations, pregnancy, birth control, and infection are some of the more common causes.

Causes of irregular menstrual bleeding
Illustration by Jessica Olah, Verywell


Several possible causes are related to pregnancy:

  • Implantation bleeding/pregnancy: Spotting may occur at the time the fertilized egg implants in the uterus and begins to grow.
  • Miscarriage: You may or may not have known you were pregnant, and the bleeding is a sign that the pregnancy has ended.
  • Abortion: Bleeding can be a sign that the pregnancy was terminated using medication or a procedure.
  • Ectopic pregnancy: This occurs when a fertilized egg implants outside of the uterus.

Birth Control

You may see bleeding related to your birth control method:

  • Oral contraceptives: Starting, stopping, or missing oral contraceptives (birth control pills) or estrogen can lead to spotting or bleeding.
  • Other hormonal birth control methods: Irregular vaginal bleeding might be seen when using the contraceptive patch, implant, or injection.
  • Intrauterine devices (IUDs): Intrauterine devices are known to cause occasional spotting.

Hormonal Conditions

Bleeding may be seen in conditions that affect your hormones:

Common Infections

There are several infectious diseases that may cause bleeding:

Other Causes

Various possible causes include:

  • Injury to the vagina from insertion of foreign objects or sexual trauma
  • Uterine fibroids (noncancerous growths in the uterus)
  • Malignant cancers, including cervical cancer, uterine cancer, uterine sarcoma, ovarian cancer, and vaginal cancer
  • Certain drugs, particularly anticoagulants and tamoxifen
  • Certain gynecological procedures
  • Urethral prolapse or polyps

When to See a Doctor

Any unexplained vaginal bleeding between periods is a reason to call your healthcare provider. While it needs to be reported at any age, it is especially a concern for girls who haven't yet go through puberty and for women who are past menopause. If you are pregnant and you have spotting or bleeding, you need to see your doctor.

You should seek immediate medical care if the bleeding is heavy, or if it is accompanied by pain, fever, dizziness, chills, nausea, or vomiting.

If you are unsure about where the blood is from your vagina or another source, insert a tampon. If you continue to have bleeding, it may be coming from your anus or urinary tract instead of your vagina. You should see your doctor in these cases as well.


You should expect to give your full medical history when you visit your healthcare provider for diagnosis of bleeding or spotting between periods. Also expect to have a pelvic exam, including a Pap smear if you haven't had one recently.

If you've kept a menstrual cycle calendar, it will help answer any questions your healthcare provider may have about your bleeding. These questions may include:

  • How long have you experienced bleeding between periods?
  • Does it happen every month or is this the first time?
  • At what point during your menstrual cycle did the bleeding begin and how long did it last?
  • Do you experience menstrual cramps when bleeding between periods occurs?
  • Does anything make the bleeding worse or better?
  • Is the bleeding worse with increased physical activity?

If you are pregnant or recently had a miscarriage or abortion, it is important to let your doctor know. The same applies if you have experienced any injury or undergone any intrauterine medical or surgical procedure.

If you’re visiting a doctor for the first time, she’ll want to know how old you were when you first started having periods, whether you’re sexually active, and what birth control method you may be using.

Remember to inform your healthcare provider about any prescription or over-the-counter medications (including herbal supplements) that you are taking.


The treatment for your vaginal or uterine bleeding will depend on the answers to your healthcare provider’s questions, as well as the findings of your pelvic exam. Based on the initial evaluation there may be additional tests or treatment needed. But always treat unexplained or unfamiliar vaginal bleeding as the serious symptom it is.

Bed rest may be recommended if the bleeding occurring between your periods is heavy. Use your menstrual cycle calendar to record the number of tampons or pads you use. This information can help your doctor determine whether or not you are bleeding excessively.

Unless your doctor tells you otherwise, do not take aspirin while you are menstruating. Aspirin can thin the blood, which may only promote and increase vaginal bleeding

A Word From Verywell

You are right to be concerned about abnormal vaginal bleeding, and you should discuss it with your doctor. While it may have a cause that is only a minor concern, it can also be a sign of a condition that needs attention, including pregnancy.

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