Dark Red/Brown & Clumpy Period: Causes & What to Expect

Dark red/brown, clumpy menstrual blood can result from:

  • Old blood: Slower flow allows oxidation.
  • Blood clots: Large endometrial pieces; common with heavy flow.
  • Endometriosis: Heavy, painful periods with dark blood.
  • Adenomyosis: Similar to endometriosis.
  • Fibroids/polyps: Cause heavy, dark bleeding.
  • Cancer (rare): Uterine/cervical malignancy.

If concerned about color, consistency, or associated pain, see your doctor for evaluation and appropriate management.

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