Aging changes in the kidneys and bladder

The kidneys filter the blood and help remove wastes and extra fluid from the body. The kidneys also help control the body’s chemical balance.

The kidneys are part of the urinary system, which also includes the ureters, bladder, and urethra.

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Muscle changes and changes in the reproductive system can affect bladder control.

AGING CHANGES AND THEIR EFFECTS ON THE KIDNEYS AND BLADDER

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As you age, your kidneys and bladder change. This can affect their function.

Changes in the kidneys that occur with age:

• Amount of kidney tissue decreases and kidney function diminishes.
• Number of filtering units (nephrons) decreases. Nephrons filter waste material from the blood.
• Blood vessels supplying the kidneys can become hardened. This causes the kidneys to filter blood more slowly.

Changes in the bladder:

• The bladder wall changes. The elastic tissue becomes stiffer and the bladder becomes less stretchy. The bladder cannot hold as much urine as before.
• The bladder muscles weaken.
• The urethra can become partially or totally blocked. In women, this can be due to weakened muscles that cause the bladder or vagina to fall out of position (prolapse). In men, the urethra can become blocked by an enlarged prostate gland.

In a healthy aging person, kidney function declines very slowly. Illness, medicines, and other conditions can significantly degrade kidney function.

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COMMON PROBLEMS

Aging increases the risk of kidney and bladder problems such as:

• Bladder control issues, such as leakage or urinary incontinence (not being able to hold your urine), or urinary retention (not being able to completely empty your bladder)
• Bladder and other urinary tract infections (UTIs)
• Chronic kidney disease

WHEN TO CONTACT A MEDICAL PROFESSIONAL

Contact your health care provider right away if you have any of the following:

• Signs of a urinary tract infection, including fever or chills, burning when urinating, nausea and vomiting, extreme tiredness, or flank pain
• Very dark urine or fresh blood in the urine
• Trouble urinating
• Urinating more often than usual (polyuria)
• Sudden need to urinate (urinary urgency)

As you grow older, you will have other changes, including:

• In the bones, muscles, and joints
• In the male reproductive system
• In the female reproductive system
• In organs, tissues, and cells

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