I keep on having back pains and burnish pain on my lower abdomen, i don't think i have uti as i don't have any symptoms for that, what can this be related to?

Depends on details: If in lower back, some causes of pain there include: back muscle strain, back ligament sprain, fractured vertebra (spondylolysis), slipped vertebra (spondylolisthesis), herniated disc, spinal stenosis, spinal arthritis, urine infection, kidney infection or stone; tumor in the spine, kidney, or elsewhere; fibromyalgia, etc... With such a big list of possibilities, one's doctor needs to evaluate.