I was told that i have mod. blood in urine but no uti, what can be an issue? i am having low back pain (pinching) & unusual heart palpitations.

Micro-hematuria: Microscopic hematuria is fairly common and often from a benign familial tendency. Unfortunately, blood in the urine is also often the only sign one gets from some conditions that need to be discovered, like bladder or kidney cancer or kidney stones. See a urologist for workup. It likely will involve an office cystoscopic exam and upper urinary tract imaging.

First confirm: that it is blood in the urine and not a contaminant. (menstrual bleeding, myoglobin-which will cause the urine to dip positive for blood but reveal no red blood cells under the microscope) If you have RBC's in the urine, you may need to look further up-stream (bladder / kidney / kidney stone). Start by getting a good exam and assessment.