Spotting Between Periods: What Causes It and When to See a Doctor
A woman looks confused, holding a sanitary pad in one hand and a menstrual calendar in the other, showing she’s dealing with irregular or delayed periods.
Seeing blood between periods — whether a faint stain, pink discharge, or frank spotting — is understandably alarming for most women. And yet it is also one of the most commonly dismissed symptoms in gynaecological practice, attributed to "stress" or "hormones" and left uninvestigated.
Most causes of intermenstrual bleeding are benign and easily treated. But some require prompt evaluation — and the distinction between them requires a proper clinical assessment, not reassurance based on probability alone.
Dr. Shachi Singh, consultant gynaecologist at Prakash Hospital, Sector 33, Noida, explains the most important causes of spotting between periods.
What Is Intermenstrual Bleeding?
Intermenstrual bleeding (IMB) — also called breakthrough bleeding or spotting — is any vaginal bleeding occurring outside the normal menstrual period. It may range from a faint pink discharge to heavier bleeding that mimics a light period.
It is distinct from:
- Postcoital bleeding: Bleeding specifically after sexual intercourse (this has its own significance and is discussed below)
- Postmenopausal bleeding: Any bleeding after 12 months without a period — always requires investigation
Common Causes
1. Hormonal Contraceptives
The most common cause of spotting between periods in women of reproductive age. Occurs particularly in:
- The first 3 to 6 months of starting a new oral contraceptive pill: As the endometrium adjusts to the new hormonal environment. Usually resolves spontaneously.
- Missed or late pills: Missing a combined pill by more than 12 hours or a progestin-only pill by more than 3 hours causes hormonal fluctuation and breakthrough bleeding.
- Progestin-only methods (mini-pill, Depo-Provera, Nexplanon, Mirena): Irregular bleeding and spotting are a recognised and common side effect, particularly in the first 3 to 6 months.
- Emergency contraception: The morning-after pill causes irregular bleeding in many women in the cycle following its use.
2. Ovulation Spotting (Mittelschmerz)
Some women notice a very small amount of spotting or pinkish discharge at mid-cycle, around the time of ovulation. This is caused by the brief drop in oestrogen that accompanies the LH surge triggering ovulation. It is harmless and self-limited — lasting a day or two.
3. Cervical Polyps
Cervical polyps are soft growths on the cervix that bleed easily with minimal provocation — causing postcoital bleeding and intermenstrual spotting. They are visible on speculum examination, almost always benign, and easily removed.
4. Endometrial Polyps
Polyps on the uterine lining cause irregular bleeding that may include spotting between periods, heavier periods, and postcoital bleeding. Diagnosed on ultrasound (particularly saline infusion sonography) and treated hysteroscopically.
5. Uterine Fibroids
Submucosal and intramural fibroids that distort the uterine cavity cause irregular and heavy bleeding. While fibroids more typically cause heavy periods, irregular intermenstrual spotting also occurs.
6. Cervicitis (Cervical Inflammation)
Inflammation or infection of the cervix — from STIs including chlamydia, gonorrhoea, or herpes, or from non-specific inflammation — causes a fragile cervix that bleeds easily, producing postcoital bleeding and intermenstrual spotting. Chlamydia in particular is a common cause of cervicitis that is frequently asymptomatic except for irregular bleeding.
7. Endometritis
Infection or inflammation of the uterine lining. Causes irregular bleeding, sometimes with pelvic pain or discharge. Can occur after delivery, miscarriage, or uterine procedures.
8. Cervical Ectropion
When the glandular cells that normally line the cervical canal extend onto the outer surface of the cervix, the result is a cervical ectropion (sometimes called cervical erosion — a misnomer as there is no erosion). This tissue is more fragile than normal cervical surface cells and bleeds easily with contact. Very common in women on the pill and in pregnancy. Usually requires no treatment unless symptomatic.
9. Thyroid Disorders and Hormonal Imbalance
Both hypothyroidism and hyperthyroidism disrupt the hormonal cycle and can cause irregular bleeding patterns including intermenstrual spotting. PCOS — through its effect on oestrogen/progesterone balance — also causes irregular spotting.
Hormones concept with pills, alarm clock, notebook labeled hormones, and female symbol representing causes of hormonal imbalance in women.
10. Endometrial Hyperplasia
Abnormal thickening of the uterine lining — from prolonged oestrogen exposure without adequate progesterone — causes irregular and unpredictable bleeding. Women with PCOS, perimenopause, or obesity are at higher risk. Endometrial biopsy confirms the diagnosis. Treatment depends on the severity (ranging from progestin management to hysterectomy for atypical hyperplasia).
The Causes That Must Not Be Missed
1. Cervical Cancer
Postcoital bleeding and intermenstrual spotting are among the most common early symptoms of cervical cancer. This does not mean that every woman with these symptoms has cervical cancer — it means they deserve cervical examination and Pap smear evaluation without delay.
2. Endometrial Cancer
In perimenopausal and postmenopausal women, irregular bleeding (including any amount of postmenopausal bleeding) requires endometrial assessment to exclude endometrial cancer.
When to See a Doctor — The Practical Guide
See your gynaecologist promptly if:
- Spotting or bleeding is occurring regularly between periods (more than occasional isolated episodes)
- You have postcoital bleeding (bleeding after sexual intercourse) — this always warrants cervical examination
- You have postmenopausal bleeding — any amount, any frequency
- Spotting is accompanied by abnormal discharge (colour, odour)
- You have pelvic pain or pressure alongside irregular bleeding
- You are over 40 with new-onset irregular bleeding
Can be monitored if:
- You have just started a new contraceptive pill and have spotting in the first 1 to 3 months — this is expected
- You have identified a single episode that coincides with ovulation and have no other symptoms
Investigation
Depending on the clinical picture, investigation includes:
- Cervical examination: To assess for cervical polyps, ectropion, cervicitis, or visible cervical lesions
- Pap smear: If overdue or if cervical pathology is suspected
- STI testing: If cervicitis or STI is in the differential
- Transvaginal ultrasound: To assess the uterus, endometrial thickness, polyps, and fibroids
- Hormonal blood tests: TSH, FSH, LH, prolactin as indicated
- Endometrial biopsy: For women over 40, perimenopausal, or with other risk factors for endometrial hyperplasia or cancer
To book a consultation with Dr. Shachi Singh, call: +91 97023 46853
Clinic Hours: Monday to Saturday, 9 AM – 6 PM | Sunday, 10 AM – 2 PM
Clinic Address: D-12A, 12B, Sector-33, G.B. Nagar, Noida, Uttar Pradesh 201301
This blog is for informational purposes. Consult Dr. Shachi Singh or a qualified gynaecologist for assessment specific to your bleeding pattern.
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