HI. Since the pain in the right side lower abdomen is a common occurrence , there are may diseases we have to rule out: It may be due to appendicitis, lymph node mass, colitis , typhlitis and so on. The pain may mimic like a sprained muscle and hence it is required to be examined by a General Surgeon to determine whether it is due to pulled muscle or some inflammatory process inside the abdomen. Ultrasonography and / or CT scan of the abdomen helps in many cases for differentiation. If this is muscle problem a muscle relaxant with an anti-inflammatory medicines will solve the problem. If this is due to internal problem you will need additional antibiotic, metronidazole and / or surgery to remove the inflamed part.