There are two common reasons that may explain why your left Achilles tendon hurts first thing in the morning -- injury or positioning. If you participate in sports or are physically very active, you may have an overuse tendinopathy -- a condition that causes micro-tearing of fibers in the tendon.

The extensor tendons are the tendons that run across the top of the foot and attach into the toes. These tendons function to pull the foot upward and work with the resistance of the Achilles tendons, as well as the calf muscles that aid in moving the foot downward.

Using cold and heat therapies correctly can help speed the healing of injuries such as a strained Achilles tendon. Using them incorrectly won't cause serious damage, but doing so can increase pain and swelling, rather than reduce them.

Finger movements are controlled by tendons -- connective tissue cords that attach your finger bones to muscles in your forearms. Overloading your finger tendons by lifting an item that is too heavy, or lifting too quickly can cause inflammation in these tendons, a condition broadly called tendinitis.

The Achilles tendon is the largest tendon found in the body and can hold pressures of more than 1,000 lbs., according to the American Orthopedic Foot and Ankle Society. It is located in the back of the heel and connects the heel bone to the muscles of the calf.

Tendinitis is the inflammation and swelling of the joints between two muscles known as tendons. Tendinosis or degeneration of the tendons may accompany tendinitis, which is characterized by severe pain at night or during an activity, especially near the joints.

Tearing your biceps tendon is a very painful injury that results from overexertion of the muscle due to lifting too much weight or falling on an outstretched arm. Over 90 percent of all biceps tendon tears happen near the shoulder, rather than near the elbow, according to the MDGuidelines website.

There are several different tendons in the foot, all of which can become pulled if over-used. Tendons are tissues that connect muscle to bone, and extensive muscle exertion can put strain on the connections. If you believe you have pulled a tendon in your foot, it is important to see your doctor.

Tendons are bands of connective tissue that connect muscles to bones. The tendons in the ankle allow muscles in the leg (such as the calf muscles) to move the foot. Torn tendons are a common sports injury and, aside from being painful, can cause weakness or loss of function of some motions within the ankle.

Tendinitis and arthritis both result from inflammation of the tissues at joints, causing pain and hampering the ability of the joints to move smoothly and easily. However, they affect different tissues at the joints, result from different factors and have different treatments.

Forearm tendonitis – also called tendinitis -- is the inflammation, irritation and swelling of the tendons in the forearm. You may develop forearm tendonitis if you perform a lot of barbell curls in your weight training program.

Tendonitis is a painful condition that typically affects the joints and can limit movement and mobility. The tendons perform a vital function in the body and connect your muscles to your bones.