Causes of irregular intermenstrual bleeding are infections (cervicitic, endometristis) pelvic inflammatory disease, tumors (cervical polyp, fibroids, cervical cancer & other cancers of the genital tract), drugs like anticoagulants, hormonal contraception (pills, IUD) & few more causes.
You mst see a gynecologist for evaluation, accurate diagnosis & treatment. Evaluation may inlcude pelvic exam, blood work, ultrasound, PAP smear & possibly endometrial biopsy.
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Please note that the information provided is not a substitute to medical advice.