Kidney pain when bending

An enlarged prostate gland is usually the cause of lower back pain when bending your knees. The prostate is a small gland that sits just below the bladder, and it expands with age and the pressure of holding urine. It can become enlarged if the prostate becomes stiff and can’t expand as it should.

Symptoms of an enlarged prostate include a weak urine stream, difficulty getting up out of a chair, a burning sensation when urinating, and the need to urinate often.

In some cases, the pain might also feel like a burning sensation in the back of your genitals.

The pain is usually felt when you bend your knees. It can be worse when you stand up and at the end of the day.

You might also feel a burning sensation when you urinate.

If this is the case, your doctor may recommend an ultrasound to check the prostate size.

Kidney stones

You may experience pain in your lower back when you go to the bathroom. This pain can be more severe when you stand up after a bowel movement.

Kidney stones are hard, solid masses made of crystals that can block your urinary tract. They can be very painful and can move from one side of the urinary tract to the other.

Kidney stones are usually caused by an increase in the amount of waste products in your body.

Symptoms can include pain, a burning sensation, and a frequent need to urinate.

Kidney stones can be prevented by controlling your urine output. Your doctor may recommend a urine test to check for kidney stones.

Perforated colon

Sometimes the lining of your colon, the large intestine, can tear during a bowel movement. This can cause pain in your lower back and lower abdomen.

Signs that you might have a perforated colon include blood in your stool, pain while passing stool, and a dull, aching pain in your lower abdomen.

Perforated colon usually isn’t a cause for alarm, but it should be checked by your doctor. It can become a medical emergency if it’s causing you severe pain and is causing abdominal distention.

Perforated colon is more common in people who are obese and who have a sedentary lifestyle.


Peritonitis is inflammation of the lining of the abdominal cavity and can occur in the peritoneum, which is the lining of the peritoneal cavity. It can lead to abdominal pain and a high fever.

The pain is usually felt in the lower middle area of your abdomen, and it can be worse when you stand up after a bowel movement.

When your abdomen is tense, it puts pressure on the peritoneum, and this can cause inflammation.

You may also feel a burning sensation when you urinate or have a bowel movement.

Peritonitis is usually treated with antibiotics, but it can also cause a loss of appetite, vomiting, and dehydration. Severe abdominal pain and a fever can be signs of peritonitis that requires emergency care.

Testicular torsion

Testicular torsion is a condition in which the testicles twist around their blood vessels, causing pain and swelling near the lower abdomen.

Testicular torsion can happen suddenly, usually during or after a strenuous activity, such as a bicycle ride or a heavy squat.

The exact cause of testicular torsion isn’t always clear, but it often occurs in people who are sedentary and have a history of testicular swelling.

Symptoms can include pain, swelling, and a fever.

Testicular torsion can be life threatening and requires immediate medical attention.

Ureteral obstruction

The ureter is a tube that carries urine from the kidney to the bladder. It can become blocked, causing pain in the lower abdomen.

Ureteral obstruction happens when the ureter becomes blocked and can’t pass urine. This can cause pain in the lower abdomen and a burning sensation when you urinate.

Ureteral obstruction usually happens when there is a tumor blocking the ureter.

Treatment for ureteral obstruction is usually surgery.

Fractured rib

A fractured rib can happen when a rib bone breaks and can cause pain and swelling in the lower abdomen.

Fractured ribs can be caused by a fall, injury, or a direct blow to the rib.

Fractured ribs can also be caused by the metastasis of a cancerous tumor.

If you have a history of fractures, you should protect your ribs while playing sports and while doing other activities that might cause you to fall.

Fractured ribs can be treated by splinting an area of the rib and by elevating it to reduce pain and swelling.

When to see your doctor?

See your doctor if you have lower back pain along with other symptoms that may be related to an underlying condition.

Your doctor will want to rule out more serious conditions, such as testicular torsion and peritonitis, before treating your back pain.

The symptoms of testicular torsion and peritonitis can also be signs of other medical conditions.

Your doctor will want to do a physical exam to look for signs of an underlying condition.

They will likely do a complete blood count and an abdominal and rectal exam to check for signs of infection.

They may also order imaging tests, like X-rays and CT scans, to help diagnose your condition.

How is it treated?

Your doctor will likely recommend that you get treatment for the underlying cause of your lower back pain.

For example, if a tumor is causing your back pain, your doctor will likely recommend that you get a tumor biopsy and a CT scan.

They may also recommend that you get surgery to remove the tumor.

If you have peritonitis, your doctor will likely treat you with antibiotics and fluids. You can also take over-the-counter pain relievers if your pain is severe.

Your doctor may also prescribe an anti-inflammatory medication to reduce pain and swelling.

What’s the outlook?

Lower back pain is usually a symptom of an underlying condition, such as a hernia or kidney stone.

The underlying condition will need to be treated before you can be diagnosed with lower back pain.

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