Could a period every 15 days be a sign of fibroids or cancer?

Why am I getting my period every 15 days? Could it be fibroids or cancer?

It’s unsettling when your cycle shows up more often than you expect. A “normal” menstrual cycle runs every 21–35 days, with bleeding lasting 3–7 days. If you’re bleeding every 15 days (or noticing spotting between periods), that pattern is called polymenorrhea. While fibroids or—even more rarely—cancer can cause frequent bleeding, there are many other, far more common reasons. Here’s what you need to know.

Understanding your cycle and polymenorrhea
• A typical cycle:

• Begins on the first day of bleeding
• Ends the day before your next period
  • Polymenorrhea:
• Cycles shorter than 21 days
• May mean bleeding every 2 weeks or spotting between periods

Seeing blood that often can interfere with work, social life and even iron levels. It’s important to uncover the cause and find the right treatment.

---

Common causes of bleeding every 15 days

1. Hormonal imbalance

   • Estrogen and progesterone regulate your cycle.
   • Conditions like polycystic ovary syndrome (PCOS), thyroid problems or elevated prolactin can throw hormones off balance, leading to shorter cycles or spotting.

2. Uterine fibroids

   • Noncancerous growths in the uterus.
   • Can cause heavier, longer or more frequent periods.
   • Often painless, but large fibroids may create pelvic pressure or cramping.

3. Uterine polyps and adenomyosis

   • Polyps: small, benign growths on the uterine lining.
   • Adenomyosis: when the uterine lining grows into the muscle wall.
   • Both can trigger irregular, frequent bleeding.

4. Birth control and hormone therapies

   • Starting, changing or stopping birth control pills, patches, rings or IUDs can cause breakthrough bleeding.
   • Imbalances right after insertion of a hormonal IUD often settle after 3–6 months.

5. Stress and lifestyle factors

   • Severe stress, extreme weight loss or gain, and intense exercise can disturb cycles.

6. Bleeding disorders

   • Conditions such as von Willebrand disease or platelet disorders can lead to heavier or prolonged bleeding.

7. Perimenopause

   • The transitional years before menopause often bring irregular cycles, spotting and more frequent periods as hormone levels fluctuate.

8. Rarely, cancer

   • Endometrial (uterine) or cervical cancers can present with abnormal bleeding.
   • More common in women over 50, with risk factors such as obesity, diabetes or a history of endometrial hyperplasia.

---

Fibroids: what to watch for

Uterine fibroids are very common—up to 70% of women develop them by age 50—and most are benign. Signs include:

• Heavy menstrual bleeding (soaking through pads or tampons in under an hour)
• Periods lasting longer than a week
• Pelvic pain, pressure or fullness
• Frequent urination or constipation (if fibroids press on bladder or bowel)

Diagnosis usually involves a pelvic exam and ultrasound. Treatment ranges from watchful waiting to medications (hormonal or nonhormonal) to procedures like uterine artery embolization or, in severe cases, surgery.

---

Could it be cancer?

Cancer is a less common cause of frequent periods, but you shouldn’t ignore warning signs. Endometrial (lining) cancer or cervical cancer can cause:

• Bleeding after intercourse
• Bleeding between periods
• Irregular, heavy periods and postmenopausal bleeding

Risk factors include age over 50, obesity, diabetes, high blood pressure, family history of gynecologic cancers and extended use of estrogen without progesterone. If you have any of these factors and abnormal bleeding, don’t delay evaluation.

---

When to seek medical attention

Most causes of polymenorrhea are benign and treatable. However, make an appointment if you experience:

• Bleeding so heavy you’re changing pads/tampons every hour
• Periods lasting more than 10 days
• Dizziness, shortness of breath or chest pain (signs of severe anemia)
• Pelvic pain that interferes with daily life
• Bleeding after menopause or between periods

You might also consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to help you sort through your symptoms and decide how urgently you need to see a provider.

---

How your provider will evaluate you

1. Medical history and cycle tracking
   • Note the length of your cycles, bleeding duration, flow heaviness and any other symptoms.
2. Physical and pelvic exam
3. Ultrasound or sonohysterogram
   • Visualize fibroids, polyps or thickened uterine lining.
4. Blood tests
   • Check hormone levels, thyroid function, complete blood count to assess anemia.
5. Endometrial biopsy or Pap test
   • Rule out precancerous changes or cancer cells.

---

Treatment options

Depending on the cause and your goals (fertility, symptom relief), your doctor may recommend:

• Hormonal therapies: birth control pills, patches, progestin IUDs or GnRH agonists
• Nonhormonal medications: NSAIDs (ibuprofen), tranexamic acid for heavy bleeding
• Minimally invasive procedures: uterine artery embolization, endometrial ablation
• Surgical options: myomectomy (fibroid removal) or hysterectomy in severe, refractory cases

Lifestyle steps—managing stress, maintaining a healthy weight and gentle exercise—can also help regulate your cycle.

---

Take charge of your health

If you’re asking “why am i getting my period every 15 days,” remember that frequent bleeding can have many causes—most are treatable. Start by tracking your cycle, symptoms and any changes in lifestyle or medications. Use a free, online symptom check, using the doctor approved Ubie Symptom Checker, to get personalized guidance on next steps.

Above all, don’t ignore persistent changes in your period. While fibroids and hormonal issues are common culprits, cancer—though rare—must be ruled out. Speak to a doctor promptly about any bleeding that’s heavy, prolonged or accompanied by pain, anemia or risk factors for cancer. Early evaluation and treatment can help you feel better and protect your health.