This is information I found on line:
You have a UTI when any of these body parts become infected by bacteria. On the other hand, a bladder infection is when specifically your bladder becomes infected. A bladder infection is a lower UTI infection. This means that all bladder infections are UTI’s but not all UTI’s are all bladder infections. Why is knowing the difference important? Well, where most bladder infections are much more of an annoyance than a life threatening illness, it’s important to know if you are dealing with a bladder infection or a kidney infection, (an upper UTI) which have much more serious health consequences.
Kidneys filter toxins from your blood which is essential for you to live. Kidney infections are no joke because they can cause permanent damage to your kidneys. People who already have problems with their kidneys are also at risk of kidney failure. Key symptoms of a kidney infection are the same as a bladder infection PLUS lower back pain, fever, and nausea. Bladder infections left untreated can turn into kidney infections.
Here is the link to the article, hope it helps https://uqora.com/pages/bladder-infection-vs-uti