Hi, here are my symptoms: 1. low grade pain in lower left side of abdomen/pelvic area, radiates to the back. 2. area swollen and tender to touch 3. less urinating but no burning 4. missed period about 2 weeks ago 5. definitely not pregnant ?

If not constipation,: If not pregnant and if not constipation (collection of stool in the left lower abdomen) that goes away with a bowel movement, then her primary care doctor can check to see what the problem might be. Her doctor can check to see if there is a mass of some kind in the abdomen or pelvis. In a woman's mid-40's, an infection, diverticulitis, benign or cancerous tumor, etc..., can cause such symptoms.

Poss pregnancy : If you still have periods (as you say) then pregnancy of some kind (including tubal/ectopic) probably needs to be ruled out, as well as urinary tract infection or stone, diverticulitis as mentioned, & other things (appendicitis less likely with pain on left but possible) Dr eval, lab, imaging all help to determine