The appendix is a small finger-like pouch located on the intestines near where the small intestine meets the colon. Stool may block the appendix and cause an infection from trapped bacteria. This infection, referred to as appendicitis, requires surgical removal of the organ, referred to as an appendectomy.

Many layers of anatomy behind the left breast can cause pain during exercise. The breast sits on top of the pectoralis major and minor muscles. Than there is the rib cage with bones, cartilage, intercostal muscles and nerves.

The menstrual cycle involves changes in hormone levels and the shedding of blood. The average length of a menstrual cycle lasts 28 days. Hormones produced during the menstrual cycle, such as estrogen and progesterone, are needed to maintain health.

An ingrown toenail occurs when your nail grows into the skin of the nail bed, usually on the side. It can be a very painful condition and can easily become infected. One remedy for an ingrown toenail is to soak the affected foot in a bath containing Epsom salts.

Itchiness behind the ears can be because of a number of causes ranging from allergies to infections. To properly treat itchiness, also called pruritis, you should consult a doctor for a definitive diagnosis.

Eating is a pleasurable time for most, especially when your favorite dishes are on the menu. If you have postprandial hypotension, though, meal time can cause a drop in your blood pressure, causing you to feel dizzy or light-headed.

Creatine is a compound that is naturally produced in your body by your pancreas. It is primarily stored in your skeletal muscles to be used in the production of energy, especially during exercise. Micronized creatine is a commercially manufactured form of creatine that consists of very fine creatine particles.

When you exercise, many physiological changes take place to make sure your muscles have enough oxygen to do their job. You blood vessels are able to widen and narrow to redirect the flow of oxygenated blood to your exercising muscles.

Stinging nettles suffer from a problem of perception -- consuming anything whose name includes "stinging" does not sound like a good idea. Thin hairs on this plant may irritate your skin if handled without gloves, and there is even a stinging nettle eating competition to test contestants' pain threshold.

The effect of caffeine on fertility has been debated through the decades. While the connection between heat and reduced sperm count seems clear, there is no similarly clear relationship for caffeine.

The human body is comprised of trillions of cells. Over 200 types of cells make up the organs, bones, muscles and nervous system. All the cells have similarities, such as a membrane on the outer surface and organelles--structures that perform cellular functions--within the cell.

Hydrogen sulfide is a toxic substance produced mainly during industrial processes. Breathing in hydrogen sulfide gas can cause shortness of breath or even death. Small amounts of hydrogen sulfide are also produced by bacteria in your gut after digestion of certain foods.