Poor circulation is a common problem that is experienced in extremities such as your feet. Because your feet are so far away from your heart, they are a common place to experience poor circulation.

Knee replacement surgery can be a life-enhancing procedure for those who suffer from chronic, disabling end-stage arthritis. Quality of life can be improved immensely, and return to near-normal function and to activities of daily living are major goals of this type of surgery.

Tendons connect muscles to bone, and forearm tendonitis is an inflammation of the tendons in the forearm. There are a number of potential causes of forearm tendonitis, including overuse of the forearm muscles, injury to your arm, or simply aging.

The acromioclavicular or AC joint is the union between your clavicle or collarbone and the acromium, which is part of your scapula. Held in place by the coracoclavicular and coracoacromial ligaments, the AC joint is an integral part of your shoulder girdle.

Iron deficiency is the most common nutritional deficiency in North America, according to the United States Centers for Disease Control and Prevention. Iron is part of every cell in the body and is an active participant in several important body functions, such as producing the hemoglobin that is in your blood.

Patellar alignment issues are common sources of knee pain. The patella, or kneecap, moves up and down as the knee bends and straightens. It moves on a "track" called the trochlear groove. When the kneecap doesn't move on the groove correctly, the condition is referred to as a patellar alignment (or tracking) problem.

Underpronation is a term that also goes by the name "supination." In the fitness industry, this means your ankle does not roll inward when your heel touches the ground while walking or running. Prolonged underpronation of the foot can lead to plantar fasciitis and tendinitis in the Achilles tendon.

Intercostal muscles are those that connect the rib cage and help hold the chest wall together. When you strain or pull one of these muscles, you may experience difficulty breathing or expanding the chest, as well as difficulty or pain when twisting, turning or bending. Neuralgia is a medical term that defines pain.

Hip bursitis -- inflammation of fluid-filled sacs that provide cushioning around bones -- is a painful condition that increases friction in your joints. Stretches decrease tightness in muscles that may be contributing to this condition. These exercises target muscles that move your leg at the hip joint.

Muscle spasms can occur for a number of reasons. The most common cause of muscle spasms is muscle fatigue, or overuse of a particular muscle, according to MedlinePlus. Sometimes a muscle spasm can feel like the muscle is hard, bulging, twitching or tight.

Your doctor might choose to administer cortisone injections if you have a rotator cuff injury. It is not generally recommended that a person have repeated cortisone injections. According to Drs. Matsen and Warme, a person should not receive more than four injections total and no more than two close together.

Soybeans are a rich source of plant-based protein and can be converted into a variety of different products, including soy milk. Although soy milk and other soy-based substances are safe for many people to eat, you are an exception if you have gout.