When you have a UTI, it’s not necessarily the infection that’s causing stomach or abdominal pain. Abdominal discomfort may be caused by various things such as digestion issues, menstruation symptoms, kidney stones, reproductive health issues and other urinary difficulties. The location and kind of pain, as well as other symptoms, might guide a healthcare provider in determining the probable reason. If they move toward the kidneys, UTIs may become more dangerous. The pain may be in the lower abdomen, or the side, or the back. You may also have a fever, chills, nausea, vomiting or feel very sick. You should see a doctor as soon as possible, since a kidney infection may become dangerous if you don’t treat it.