What can the pain in my lower right side be?

Other symptoms?: A pulled muscle is very possible? How long does it last ? Have you tried any meds? Nausea? Fevers? Diarrhea? Would you say it is more related to food or activity? Causes include muscle strain, appy (less likely), herniae, colitises, enteritises, ibs, constipation, ovaries, endometriosis. You should see your md for a complete history and physical exam. They may want to do studies as well.

Depends : You do not tell if acute or chronic & if is related to any injury. Assuming is chronic you first need to be diagnosed. Therapies are rationally determined by the cause. Up to 30% of people with chronic low back pain have this from injury to pelvic sacroiliac joint. Pain usually in low back on one side with radiation pain to groin or posterior thigh. For diagnosis see an osteopath.

Any unexplained: right sided abdominal pain must be evaluated ASAP at the ER or UC clinic.