Homeopathic arnica montana, commonly known as arnica, has been widely used in medicinal purposes for centuries. Quite often, arnica is the first remedy used in acute trauma--specifically injuries that involve bruising, sprains and head contusions--and after surgeries.

If you're a tea drinker, you may have heard of or tried Earl Grey tea, a blend of different Chinese teas with some added citrus flavor.

Yeast infections result from an overgrowth of yeast in the body. They can occur in both men and women, and often happen after antibiotic treatment, which kills both good and bad bacteria in the body. Infants can even get yeast infections as diaper rashes.

Poison ivy is considered a poisonous plant that releases urushiol, an oily substance found on the plant's leaves, stem and even roots. When urushiol comes in contact with human skin, 50 percent of people develop allergic contact dermatitis, according to the Minnesota Department of Agriculture.

For centuries, people have combined echinacea and goldenseal to restore health and battle a variety of ailments. Exactly how these herbs work is still a bit of a mystery, but some studies have proven their effectiveness for specific ailments and conditions.

You may never have heard of mangosteen, a small round fruit produced by a tropical tree (Garcinia mangostana) native to Southeast Asia.

Sleeping difficulties such as insomnia, nightmares and waking up frequently can dramatically decrease your quality of life. Prescription sleep aids frequently have undesirable side effects, causing many people to decide to just live with their insomnia.

Dating back to before the 18th century, many cultures have been using garlic for both medicinal purposes and food, according to the University of Maryland Medical Center. In modern times, garlic is still used for eating as well as a tool to help prevent many diseases and illnesses.

Peppermint is not only one of the world's oldest medicinal herbs, but it is also one of the most versatile. The essential oil -- derived from its leaves -- has long been valued by herbalists and natural healers for its wealth of therapeutic effects, including antispasmodic and pain-killing properties.

Many people have experienced the pain of an earache. Whether it comes from the middle ear or the outer ear, an earache can be very painful, though most of the time it is not a medical emergency.

Pneumonia is a serious lung infection that can be caused by bacteria, viruses, fungi, protozoa and other microorganisms. The University of Maryland Medical Center states that pneumonia is a common illness that affects millions of Americans every year.

Valerian has been used as a treatment for insomnia, anxiety, restlessness and stomach cramps for centuries.