Shoulder pain is a fairly common issue with baseball and softball pitchers, who rely on their shoulder muscles extensively to send the ball over home plate. The forceful and repetitive motion can cause these muscles to become inflamed, resulting in discomfort.

Every year, thousands of people are affected by some sort of head trauma. Head trauma is classified as an injury to the head, neck, scalp or brain. This trauma is a serious injury that can lead to major health issues, including death.

Your liver produces bile, which breaks down fats and aids in digestion, as well as removes toxins from your body. Every food you eat passes through the liver in some form.

The National Institute of Dental and Craniofacial Research estimates that 500,000 Americans experience their first bout of fever blisters every year. Fever blisters, also called cold sores, usually occur outside the mouth -- on the lips, chin, cheeks or nostrils. They are caused by the herpes simplex type 1 virus.

Propylene glycol is found in many industrial and commercial products, including antifreeze, liquid laundry detergent solvents and paint. It is an additive in human and pet foods, pharmaceuticals and tobacco processing.

Sodium is an electrolyte that helps regulate blood pressure and fluid levels in your body; it also plays a role in the normal function of nerves and muscles. A blood sodium level below 135 mmol/L is considered low.

According to the American Academy of Family Physicians (AAFP), dental emergencies are extremely common and cause missed time at work and school. Most emergencies are the result of a severe toothache. Analgesics and antibiotics are frequently prescribed to relieve the pain.

The fungal infection on your heels is likely a form of athlete's foot, a relatively common and very treatable condition, and your doctor will probably prescribe a topical antifungal medication for you to apply directly to the affected skin.

Aches and soreness after a tough workout can remind you of the hard work you put in at the gym -- or signal a more serious injury, such as a muscle strain.

Systane is an artificial tear drop used to treat various types of dry eye by reducing feelings of burning, grittiness and irritation. Systane eye drops can be used multiple times during the day, and are available over the counter in several different formulations.

Caffeine is normally harmless when ingested by healthy people. However, it is a good idea to use caution when drinking caffeinated beverages if you are currently taking certain medications. Zithromax is an antibiotic available in a number of forms, including a pack of six 250-milligram tablets commonly known as a "

If you have the odd feeling that the word around you is unreal, dreamlike or distorted, you are experiencing a moment of derealization. This psychiatric symptom can be scary, but if it's a mild feeling that passes quickly, it isn't necessarily cause for concern. Derealization is not a common side effect of caffeine.