An inner thigh muscle pull, or groin strain, can be a very painful injury. When the inner thigh muscle is lengthened too far some of the muscle fibers break, causing a partial tear. In more severe cases it can cause a complete tear or rupture of the muscle.

Most lower back pain results from strained muscles or ligaments, and though often painful, usually resolves on its own. Structural problems in the spine, such as herniated discs, sometimes require surgical intervention.

Torn abdominal muscles are also referred to as sprains and involve tearing of the supporting muscle fibers. This causes pain, inflammation and weakness and is usually due to improper movement during workouts or lifting of heavy objects.

Flexor mass muscles are found in the forearm. This group of muscles that enable you to grip objects, throw a ball and flex and extend your hand at the wrist. If you've injured your flexor mass muscles, you'll notice a number of signs and symptoms.

The shin contains muscles that run down the front of the tibia, called the tibialis anterior. Shin splints is known clinically as medial tibial stress syndrome, or MTSS.

Shin splints, though a commonly used term, is not a clinically defined medical diagnosis. The term generally refers to pain that occurs in the shins. The shin bone is known as the tibia, and is the second largest bone in the body, after the femur in the upper leg.

Retrolisthesis is a relatively rare degenerative spinal disc condition that originates in the lower area of the spine. The condition may cause lower back and lower extremity pain in some cases.

Almost everyone experiences at least one painful leg cramp at some point in life, according to the American Academy of Orthopaedic Surgeons. Potassium, a mineral which, if you have a deficiency, could cause leg cramps, plays an important role in muscle contraction.

Your body uses vitamins and minerals to carry out its normal functions and maintain its health, including that of the bones and muscles.

Physically active people are more vulnerable to strains of the intercostal muscles, located between your ribs, but twisting your body in unexpected ways can cause the injury in anyone.

Metatarsal fractures -- injuries to the long bones in your foot -- can occur from direct trauma or overuse. Stress fractures in the metatarsals commonly occur from activities such as long-distance running and ballet dancing.

Neck strain often results from improper posture or overuse.