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LunWise

When to see a doctor about your period

By the LunWise editorial team. Updated October 11, 2026. 4 minute read.

Many period changes are harmless, but some are worth checking. These signs come from clinical guidelines. None of them means something is definitely wrong, and all of them are worth a conversation.

Get care promptly if

  • You soak through one or more pads or tampons every hour for several hours in a row
  • You feel dizzy, faint or short of breath with heavy bleeding
  • You have sudden, severe pelvic pain
  • You could be pregnant and have bleeding with pain

Book an appointment if

  • Your periods last longer than 7 or 8 days
  • You pass clots about the size of a quarter or larger, need to double up on protection, or change pads or tampons overnight
  • Your cycles are often shorter than 24 days or longer than 38 days
  • Your cycle length varies by more than about a week from cycle to cycle
  • You bleed between periods or after sex
  • You haven't had a period in 90 days and aren't pregnant
  • You have any bleeding after 12 months without a period

Bring your history

Clinicians often ask about cycle length, how long bleeding lasts and how heavy it is. A record of your last few cycles makes the appointment faster and more useful. LunWise creates a one-page report you can print or share as a PDF.

See how LunWise flags patterns

Questions and answers

How heavy is too heavy for a period?

The American College of Obstetricians and Gynecologists lists signs including bleeding longer than 7 days, soaking through pads or tampons every hour for several hours, needing to double up on protection, changing protection overnight, and passing clots the size of a quarter or larger.

Is it normal to miss a period?

An occasional late or missed period can happen with stress, illness or travel. If there's any chance of pregnancy, take a test. Going 90 days without a period is worth checking with a clinician.

Sources

  1. American College of Obstetricians and Gynecologists. Heavy Menstrual Bleeding (patient FAQ).
  2. Munro MG, Critchley HOD, Fraser IS. The two FIGO systems for normal and abnormal uterine bleeding symptoms (2018 revisions). Int J Gynaecol Obstet.
  3. Eunice Kennedy Shriver National Institute of Child Health and Human Development. About Menopause.

This article is for general information and isn't medical advice. Talk to a clinician about your own health.