A rash, also called dermatitis, can cause small red bumps to develop on the chest. Some rashes may just be an embarrassing annoyance, while others, especially when combined with additional symptoms such as a fever, can be the sign of a serious condition.

Most people pass gas between 14 and 23 times a day, the National Institute of Diabetes and Digestive and Kidney Disorders states. While passing gas is embarrassing and often slightly odorous, truly foul-smelling gas is more uncommon.

The human body is made up of cells, each one of which needs to be able to provide for its energy needs by taking up nutritional molecules from the bloodstream and chemically burning them as part of cellular metabolism.

Fluid in the ear can lead to painful infection, hearing loss, balance disruption and even vomiting or diarrhea, according to MedlinePlus, a service of the U.S. National Institutes of Health.

There are several hormones that are considered "female" hormones, though some of them are naturally produced in a man's body as well. What gives them the characteristic of being a female hormone is the role they play in a woman's fertility, and the fact that they are more predominant in women than in men.

Smoking damages your body and good health in numerous ways. In addition to the adverse health effects on the smoker, smoking harms a fetus and the people around a smoker. The cost of smoking in terms of health-care resources and other economic costs cannot be underestimated.

Children as young as 6 or 7 can have hands that sweat excessively. This symptom can cause discomfort and social embarrassment. Several conditions have symptoms that include sweaty hands, but measures are available to provide relief.

The Centers for Disease Control and Prevent reports that an estimated 45 million Americans smoke tobacco. Smoking also happens to be one of the leading causes of preventable and premature death, according to the American Heart Association.

Oxygen saturation is a clinical measurement that determines what percentage of a patient's red blood cells are saturated with oxygen after passing through the lungs. It is a result that reflects not only how well a patient's lungs are working but also how effectively oxygen is being delivered to all parts of the body.

Your body uses calcium not only to keep teeth and bones strong, but also to enable muscles to contract, to assist in the transmission of neural impulses and to maintain cell membrane stability and permeability.

Pollution from car exhaust, factory emissions, fuel combustion and other sources can hang a brown cloud over some cities. Air pollution not only contributes to respiratory diseases in humans and damages buildings, it can also affect plants. The effects of air pollution on plants develop over time and can't be undone.

When tendons become tight or inflexible, they can affect your movement, causing discomfort, pain and injury. Every muscle in your body is attached to bone by tendons.