A stone is a hard piece of material that forms in your kidneys when calcium, oxalate or phosphorus substances in the urine become concentrated. Kidney stones are one of the most common urinary tract disorders and may be extremely painful to pass.

Passing a kidney stone can be a painful experience. And kidney stones often recur. According to Roger L. Sur, MD, director of University of California San Diego Comprehensive Kidney Stone Center, if you’ve had one kidney stone, there is a 50 percent chance that you will develop another within five to 10 years.

You may wake up hungry in the morning, or you might have a less hearty appetite upon waking. If you normally eat breakfast, however, and suddenly have a decreased appetite in the morning or if you are suffering from nausea when you wake up, you may have an underlying health problem.

Normally, your kidneys screen impurities from your bloodstream. The result of this process is the removal of waste materials and excess fluid in the urine. Occasionally, infections, injuries and disease hamper the ability of the kidneys to perform this process, resulting in renal insufficiency.

Your doctor may require you to spend time in bed while recovering from an illness or injury. Bed rest is also often prescribed for women having difficulties with their pregnancies. There are a number of complications that can come from an extended period of inactivity.

Kidney stones are rock-like formations that develop in or near the kidneys. They are composed of various minerals, usually calcium. Certain kidney stones may require surgery. The type of procedure depends on where your kidney stones are located and how large the stones are.

The kidneys and liver serve vital functions for overall wellness of the body. The kidneys remove waste from the body to prevent toxicity of other organs and maintain health of the entire body. The liver is the largest internal organ and aids in fighting infections, digestion and regulating blood sugar levels.

Kidney stones are crystal-like concentrations of minerals that normally pass from the kidney in urine or else become lodged in the kidney and grow larger. The condition is fairly common, with 5 percent of Americans developing these stones at some point, according to Brigham and Women's Hospital.

The pain of kidney stones -- painful mineral deposits in the urinary system -- often can be enough to make you hang up your running shoes until the stone passes. However, you don't necessarily have to give up exercise until you're feeling better.

Having chronic kidney disease means your kidney is no longer able to filter blood, extra water or waste products. In the early stages of the condition, you should limit dietary salt, protein and fat to protect your current kidney function and control blood pressure.

Decreased kidney function is a common medical condition. The causes of decreased kidney function fall into two categories, acute and chronic. A sudden decrease in kidney function, within hours to days, is called acute kidney injury or AKI.

If you, a friend or family member has chronic kidney disease, you may be wondering if there is any diet that can help repair kidney damage or reverse the disease. While some forms of kidney disease referred to as "acute kidney injury" or "acute kidney disease" can get better, most kidney disease, known as "