If you experience pain that radiates down one or both legs, a possible cause may be sciatic nerve impingement. This condition, commonly referred to as “sciatica,” occurs when the sciatic nerve that runs from the lower back down the leg becomes restricted.

Barometric pressure often causes levels of fluids in the body to fluctuate. According to The Weather Channel, many humans suffer from everything from headaches to joint pain when barometric pressure rises.

Ulcers are open sores in the lining of the gastrointestinal tract. They develop mostly in the stomach, esophagus or duodenum. Ulcers form when the environments of these surfaces are so acidic that their mucosal linings slowly erode.

The shoulder joint is a shallow ball-and-socket joint between the humerus -- upper-arm bone -- and the glenoid fossa of the scapula -- shoulder blade. A unique joint, the shoulder has only one bony attachment to the rest of the skeleton in the clavicle -- collarbone -- where it attaches to the scapula.

Author Andrew Biel notes in "The Trail Guides to the Body", that a pivot joint allows one bone to rotate around another. The first and second cervical vertebrae pivot to allow neck movement from side to side, and the ulna and radius in the forearm pivot from side to side, as well.

The sciatic nerve is one of the largest nerves in the body because it connects the spinal cord to the pelvis and legs. Because of its size and the fact that it exits the spinal column at the bottom and runs through the pelvis, the sciatic nerve can easily become pinched, resulting in a condition known as sciatica.

The hip joint is a stable ball-and-socket joint. Dislocations of this joint rarely occur without other injuries, such as a broken thigh bone or pelvis. These injuries are typically caused by high-impact trauma such as a car or bike accident or a fall from a significant height.

Nerve pain in the thigh is often caused by the pressure put on a nerve in another part of the body, such as occurs with sciatica. Sciatica is actually a pinched nerve in the lower back, but the pain radiates down the leg into the thigh.

A slipped disc in your jaw can cause painful temporomandibular joint (TMJ)-related problems, including a “popping” noise that originates inside the jaw joint. Surgery is often used to treat TMJ.

Painful movement of the joints near the tips of your fingers or toes, or your distal interphalangeal joints, may result from injuries, rheumatoid arthritis and other conditions. Your distal interphalangeal joints, or DIP joints, are the joints found near the tips of your fingers and toes.

An estimated 75 percent of Americans suffer from foot pain during their lifetime, the University of Maryland Medical Center says. While some foot pain is not serious, pain in the ankle and instep, or arch of the foot, is often a sign of a condition that requires medical treatment.

Joint pain can be a symptom of a vitamin deficiency either because the deficiency is actually damaging your joints or because it is damaging your nerves. Vitamins such as A, C and D help support numerous aspects of joint health, and a deficiency in these vitamins might cause or contribute to bone pain.