<s>[INST] Ive had mild pains in my left lower pelvic region especially when i sneeze, since i have developed a cold. I have started my period today and the pain has become more constant and is higher up my abdomen. My right shoulder blade also started mildly hurting, not constant but noticeable. Could this just be caused by my period? [/INST] Hi. Thanks for your query and an elucidated history. The pain in the left lower pelvic region and of the shoulder blade are indicative of some sort of peritonitis. May not be related to your periods. I would advise you to go to ER, get a clinical examination. IF the rebound tenderness is positive the Doctor would admit you for further investigations and treatment. You may need a Standing X-ray of abdomen, ultrasonography and other tests as he may feel necessary. Till then do not take anything orally. </s>