Spotting is any light vaginal bleeding that happens outside your regular period. It produces much less blood than a menstrual flow, typically just a few drops that show up on underwear or when you wipe, and it doesn’t require a pad or tampon. The causes range from completely harmless hormonal shifts to conditions that need medical attention, so understanding the context matters.
Spotting vs. a Period
The simplest way to tell the difference is volume. A period lasts three to seven days and produces enough blood to soak through pads or tampons. Spotting is lighter, shorter, and often stops on its own within a day or two. The color tends to differ as well: period blood is usually darker red, while spotting is more often light pink or brown.
Your body also gives you other clues. If you normally get breast tenderness, cramping, or bloating before your period and none of those symptoms are present, the bleeding is more likely spotting than an early period.
Common Hormonal Causes
Ovulation
Some women notice a small amount of pink or light red spotting around the middle of their cycle, roughly two weeks before their next period. This happens because estrogen dips briefly right before ovulation, and that temporary hormone drop can cause a thin layer of uterine lining to shed. It’s short-lived and harmless.
Hormonal Birth Control
Breakthrough bleeding is one of the most common reasons for spotting, especially in the first few months after starting or switching a contraceptive. The numbers are surprisingly high: 30% to 50% of people on combined hormonal birth control (the pill, patch, or ring) experience irregular bleeding in the first three to six months, though this drops to about 10% after three months of consistent use.
Hormonal IUDs cause frequent or prolonged bleeding in about 35% of users during the first three months, but 90% see improvement within a year. The progestin implant causes ongoing spotting in up to 23% of users, and unlike other methods, this is less likely to improve over time. Injectable contraceptives cause longer bleeding episodes in about 26% of users initially, with roughly 85% seeing resolution by 12 months.
If you’ve recently started a new method, sporadic spotting in the first three to six months is expected. If it continues well beyond that window, it’s worth bringing up with your provider.
Perimenopause
In the years leading up to menopause, estrogen and progesterone levels rise and fall unpredictably. Ovulation becomes irregular, which means some cycles produce very little progesterone to stabilize the uterine lining. The result is periods that may come closer together or farther apart, lighter or heavier than usual, and spotting between cycles. This phase can last several years and typically begins in a person’s 40s, though it sometimes starts earlier.
Implantation Bleeding in Early Pregnancy
Light spotting can be one of the earliest signs of pregnancy. When a fertilized egg attaches to the uterine lining, it can cause a small amount of bleeding, typically 10 to 14 days after ovulation. This is called implantation bleeding, and it looks different from a period: the blood is usually pink or brown, lasts anywhere from a few hours to about two days, and is light enough that you might mistake it for the very start of your cycle.
Not everyone who becomes pregnant experiences implantation bleeding, so its absence doesn’t rule out pregnancy. If you’re sexually active and notice unusually light bleeding around the time you’d expect your period, a pregnancy test is the fastest way to get clarity.
Physical Causes
Spotting after sex is common and usually not serious. The cervix has a zone of delicate tissue that can bleed easily with friction. This is especially true for people with cervical ectropion, a condition where the softer tissue from inside the cervical canal is exposed on the outer surface of the cervix. It’s more common in younger people and those on hormonal birth control, and it’s not dangerous.
Cervical polyps, which are small, smooth growths on the cervix, can also bleed with contact. They’re almost always benign. Vaginal dryness, particularly from low estrogen levels during breastfeeding or after menopause, makes the vaginal walls thinner and more prone to bleeding during intercourse. Other symptoms of vaginal dryness include burning, discomfort during sex, and a feeling of pressure.
Infections and STIs
Bleeding between periods can be a symptom of pelvic inflammatory disease (PID), an infection of the reproductive organs most commonly caused by chlamydia or gonorrhea. PID doesn’t always cause dramatic symptoms. Some people notice only mild spotting, unusual discharge, or low pelvic discomfort. Left untreated, PID can lead to more serious complications including chronic pain and fertility problems.
If spotting comes with new discharge, an unusual odor, pain during sex, or a low fever, an infection is worth ruling out. Testing is straightforward and treatment is effective when caught early.
Structural Conditions
When spotting is persistent or doesn’t fit a clear hormonal pattern, doctors look for structural causes inside the uterus or cervix.
- Polyps: Small tissue growths on the uterine lining or cervix that can cause irregular spotting. Most are benign.
- Fibroids: Benign muscle tumors in the uterine wall. Many cause no symptoms at all, but those that grow near the inner lining of the uterus can cause spotting or heavy bleeding.
- Adenomyosis: A condition where tissue similar to the uterine lining grows into the muscular wall of the uterus, often causing painful, heavy, or prolonged periods along with spotting.
- Endometrial hyperplasia or cancer: Thickening or abnormal cell growth in the uterine lining, which can cause unpredictable bleeding. Risk is higher in people with prolonged estrogen exposure without progesterone balance, such as those with irregular ovulation or obesity.
Conditions like polycystic ovary syndrome and thyroid disorders can also cause spotting by disrupting ovulation. When the body doesn’t ovulate regularly, progesterone levels stay low and the uterine lining sheds unpredictably.
How Spotting Gets Evaluated
If you bring up spotting with your doctor, the workup usually starts with your history: when the bleeding happens, how long it lasts, what medications or birth control you use, and whether you could be pregnant. From there, a pelvic exam is standard.
Blood work typically includes a complete blood count to check for anemia or signs of infection, and may include a pregnancy test, STI screening, and thyroid function tests. If those don’t explain the bleeding, imaging comes next. A pelvic ultrasound is the most common first step, using sound waves to look for polyps, fibroids, or other structural changes. In some cases, a thin scope is inserted through the cervix to view the inside of the uterus directly, or a small tissue sample is taken from the uterine lining and examined under a microscope.
When Spotting Signals Something Serious
Most spotting is benign, but certain situations call for prompt evaluation. Any vaginal bleeding during pregnancy needs immediate medical attention. Any vaginal bleeding after menopause, in someone not on hormone therapy, should be checked by a doctor. For those on continuous hormone therapy after menopause, bleeding that is heavy or persists longer than six months warrants a visit. And bleeding that soaks through one or more pads or tampons per hour for more than four hours isn’t spotting at all; it’s heavy bleeding and needs urgent care.
Spotting that shows up alongside pelvic pain, fever, or significant changes in your cycle pattern is also worth investigating sooner rather than later. A single episode of light spotting mid-cycle, on the other hand, is rarely cause for concern.