Can back pain very leftside, below waist be related to colon?? blood tests all normal

Back pain can be a : result of other issues causing pain to be referred to the back like: kidney stones, ulcers, urinary tract infections, gallbladder issues, ovarian cysts, ectopic pregnancy as well as certain vascular conditions to name a few. If symptoms are persistent or worsening, see your physician. Note that back pain is a fairly common problem too.