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PCOS in severe cases can cause abdominal pain and pelvic discomfort. If you suspect to be having PCOS (or if you have been diagnosed with PCOS), do not ignore your symptoms. Most common cause for PCOS is insulin resistance, so the use of insulin modifiers (like Metformin) and hormonal contraceptive pills usually helps with treating the symptoms and regulating periods. Be in regular follow-up with your gynecologist and report any unusual/new symptoms immediately.
Take care.