Thank you for the query.
Your pain can be caused by diverticulitis
(back pain and lower left pain, issue caused by chronic constipation
), inguinal hernia (lump present in the groin, pain aggravates when lifting heavy objects or coughing), urinary tract infection
(back pain, lower abdominal pain, groin or leg pain, frequent urinating, burning while urinating), herniated spine disc.
I suggest you to visit your doctor and have some basic tests. You should start with abdominal ultrasound, blood work, urine analysis. General surgeon
should perform physical examination. Colonoscopy should be considered in case of diverticulitis suspicion.
Hope this will help.