Hi,
Welcome to HealthcareMagic forum.
Abdominal pain and distended abdomen are not related to each other unless there is
intestinal obstruction.
Pregnancy is another instance but the distension is gradual and slow.
As per your description, the right lower
back pain is most likely related to renal stone or related to
menstruation and the abdominal distension is probably an incidental occurrence.
Are you constipated? Is there any inability to pass stool? - If the answer is yes, then intestinal obstruction needs to be ruled out.
My suggestions that can help you are:
1. Monitor the progress of symptoms.
2. You may take over the counter analgesics for pain relief.
3. Drink plenty of water.
4. Visit your doctor if the symptoms get worse or if you have bowel disturbance as mentioned above.
Hope this helps.
Regards