The shoulders, neck and head are all connected through a complex system of muscles, tendons and nerves. When there is strain in any portion of the shoulder, the pain can resonate into the head, neck, arms, jaw and chest.

Arm wrestling is an extremely competitive sport that demands enormous pectoral, biceps and deltoid power. Arm wrestling is actually a very dangerous sport that can cause fractures and ligament and muscle tears in your arm and elbow.

Ibuprofen is one of the most popular pain killers available on the market. It's a nonsteroidal anti-inflammatory drug (NSAID), so it's good for treating the symptoms of arthritis, such as swelling, aches, inflammation and irritation in tissues and joints.

Your calf muscles get a daily workout -- they can become tight from exercise, walking or even excessive sitting. Stretching the gastrocnemius and the soleus muscles before exercise helps with flexibility but sometimes even stretching causes pain along the back of your lower legs.

An interscalene nerve block is a form of local anesthetic used prior to shoulder surgery. This anesthetic is applied to specific nerves within the shoulder by an anesthesiologist using a thin needle.

Vigorous exercise boosts your body's heat production and can increase your body temperature by several degrees.

Buffer systems, whether inside your body or not, help to control the acidity of a solution. In your body, this is particularly important, as you need a very stable environment both inside and outside the cells with regard to temperature, acidity and other variables.

Numerous conditions can cause waist and leg pain. According to the MedlinePlus website, leg pain can be caused by structures within the leg itself or it can be caused by problems in other parts of the body, such as the waist or pelvic girdle.

A slightly higher than normal body temperature is common during pregnancy because of the hormone progesterone and increased metabolism. On the other hand, an infection or illness can cause your body temperature to increase too much, causing harm to you and your unborn baby.

An infected tooth can cause pain and swelling of varying degrees. Management of most cases is relatively simple, while others are severe enough to require hospitalization and the administration of intravenous drugs.

Trying to find the right over-the-counter medication to ease your toddler's allergy symptoms is often a daunting task. There seem to be a million choices: stuffy nose relief, runny nose relief, cough or any combination of these. How do you know what is safe for your toddler?

Numerous conditions can cause pain behind the ear and down the neck. According to MedlinePlus, a publication of the National Institutes of Health, neck pain can travel to other parts of the body, such as the shoulder, arm and head. In some cases, pain in various head structures can send pain to the neck.