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Abdomen has many organs and any problem with any of them can cause abdominal pain
Most common causes of lower abdominal pain would be 1)Urinary tract infection
- get your Urine analysis done , which will tell you if there is any infection.
2)Becoz you have missed your period too - consider pregnancy
too - go for a urine pregnancy test , which will help you to know if you are pregnant.
5)Pelvic inflammatory disease
The best thing is to get a abdominal ultrasound
done and know what the cause for pain is and get it treated accordingly...