Knee pain is a very common condition. Certain characteristics of knee pain, such as pain after sitting, can help to narrow the possible causes, but are not perfectly specific to any one disease. Multiple diagnostic approaches can help to establish the cause.

Located in the right upper abdomen, the gallbladder is a small pouch that stores bile until it is needed by the body. When the need arises, the gallbladder contracts and expels a small amount of bile through the bile duct and into the small intestine to aid with digestion.

Muscle spasms occur when your muscles contract involuntarily. This occurrence can be both painful and alarming, especially when you have just finished an exercise routine and may be concerned that you have experienced a muscle injury.

The patella, or kneecap, is a small bone on the front of the knee joint. Patellar subluxation occurs when the tendons that stabilize the kneecap abnormally slip out of place. This condition, which is also referred to as a partial patellar dislocation, typically occurs following traumatic injury to the knee joint.

A steady golf swing depends on steady footing. And steady footing depends to a large degree upon the shoes you wear. You spend a lot of time selecting the right clubs; taking the time to select the best shoe can be just as important, especially if you suffer from plantar fasciitis.

A knee support protects and supports your knee. They aid in helping unstable joints and prevent injury to normal, healthy joints. Knee supports are especially required when you have a moderate knee joint injury involving damage to cartilage or ligament.

A trigger finger is a condition of the flexor tendons of the finger and the A1 pulley. It results in pain and a clicking or triggering sensation of the finger after the finger is flexed. The finger cannot be extended and is locked in flexion.

Edema occurs when a large amount of fluid accumulates in the circulatory system. Edema is common in people above age 60, but anyone can be affected by it.

When the body breaks down purines, a substance found in human tissue and in many foods, uric acid forms. Uric acid dissolves in the blood and passes through the kidneys and into urine for elimination.

Doing any type of resistance training on a regular basis can actually be beneficial to people suffering from chronic joint pain, according to "Arthritis Today." However, using improper form, lifting too often or lifting weights that are too heavy can lead to joint problems.

Barometric pressure, or air pressure, is the weight of the atmosphere on a particular surface. Air pressure is closely associated with weather and can often be used to predict the forecast.

The patellar tendon connects the quadriceps muscles, the tibia or shinbone, and the patella or kneecap. Because activities such as running and jumping require frequent use of the knee joints, athletes need to strengthen the area around the patellar tendon to minimize the risk of developing an injury.