Thanks for the query.
Pain and swelling in the stomach and back could be due to many reasons. The most common ones being pregnancy. If a normal intra uterine pregnancy is ruled out, ectopic pregnancy can present I'm this way. We can also think of causes like appendicitis,ovarian cyst, ovarian tumor, fibroid, adenomyosis, pyometra, etc.
An examination by a gynecologist is needed and an ultrasound of the abdomen and pelvis will help. The doctor will treat you accordingly after that. Do not worry.
Hope this helps
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