But they tend to come back in some people. Rarely, this can lead to kidney infections, which are more serious and may result in permanent kidney damage. So it's very important to treat the underlying causes of a bladder infection and to take preventive steps to keep them from coming back. In elderly people, bladder infections are often difficult to diagnose.
http://www.webmd.com/a-to-z-guides/understanding-bladder-infections-basic-information
Bacteria enter the body from the skin around the urethra. They then travel up the urethra to the bladder. Sometimes, bacteria escape the bladder and urethra, traveling up the ureters to one or both kidneys. Pyelonephritis is a potentially serious kidney infection that can spread to the blood, causing severe illness.
http://www.webmd.com/a-to-z-guides/kidney-infections-symptoms-and-treatments
What causes a kidney infection? A kidney infection usually happens when bacteria – often a type called E. coli – gets into the urethra (the tube which carries urine out of the body) and travels up through the bladder and into the kidneys.
http://www.nhs.uk/Conditions/Kidney-infection/Pages/Introduction.aspx
If a kidney infection isn't treated, it can get worse and cause permanent kidney damage. Symptoms of a kidney infection often come on within a few hours. You can feel feverish, shivery, sick and have a pain in your back or side. Read more about the symptoms of a kidney infection.
http://www.nhs.uk/Conditions/Kidney-infection/Pages/Introduction.aspx
When to see your GP. See your GP if you have a fever and persistent tummy, lower back or genital pain, or if you notice a change to your usual pattern of urination. Most kidney infections need prompt treatment with antibiotics to stop the infection from damaging the kidneys or spreading to the bloodstream. You may also need painkillers.
http://www.nhs.uk/Conditions/Kidney-infection/Pages/Introduction.aspx
Kidney Infections: Symptoms and Treatments. Most urinary tract infections (UTIs) involve only the bladder and urethra (the lower urinary system). Pyelonephritis results when a UTI progresses to involve the upper urinary system (the kidneys and ureters). The kidneys filter the blood to produce urine.
http://www.webmd.com/a-to-z-guides/kidney-infections-symptoms-and-treatments
Here are the 9 most telling signs that you’ve fallen victim to a kidney infection…. Pain and discomfort on the side of the affected kidney is common with a kidney infection. You may also feel a dull pain in your lower back as well as in the genital area.
http://www.activebeat.co/your-health/9-signs-you-may-have-a-kidney-infection/
Vaginal intercourse makes it easier for bacteria to reach the bladder through the urethra. The risk for bladder infection -- dubbed honeymoon cystitis -- increases with frequent sex. Pregnant women, whose urinary tracts change in response to hormones and increased kidney function, are also prone to infections.
http://www.webmd.com/a-to-z-guides/understanding-bladder-infections-basic-information
A kidney infection (pyelonephritis) is a painful and unpleasant illness caused by bacteria travelling from your bladder into one or both of your kidneys. It's more serious than cystitis, a common infection of the bladder that makes urinating painful.
http://www.nhs.uk/Conditions/Kidney-infection/Pages/Introduction.aspx
Medically known as, Pyelonephritis, a kidney infection won’t cause any serious kidney damage if it’s treated early. 1. Kidney Pain. Pain and discomfort on the side of the affected kidney is common with a kidney infection. You may also feel a dull pain in your lower back as well as in the genital area. Obviously, every patient with a kidney infection feels different degrees of pain (in fact, some have zero pain) and different symptoms.
http://www.activebeat.co/your-health/9-signs-you-may-have-a-kidney-infection/
what are the most serious symptoms of a kidney infection in females
The most serious symptoms of a kidney infection in females are like feeling feverish, shivery, sick and having pain in your back or side. The most serious symptoms of a kidney infection in females are they will feel feverish, shivery, sick and have a pain in your back or side.