Central nervous system fatigue is a complex and multifaceted phenomenon that involves peripheral muscle fatigue and the failure to initiate and sustain voluntary drive to the muscles by the central nervous system.

Fatigue is a common complaint today. Many people are tired occasionally, after a busy, over-scheduled day, but when fatigue becomes chronic and interferes with daily activities, there may be an underlying reason. A recent survey by Sydney's Woolcock Institute of Medical Research in Australia found that 11.

Many people rely on caffeine to get them up in the morning and sustain them throughout the day. However, high caffeine intake can increase the impact that physical and mental stress has on your body.

Your immune system is a vital part of your overall well being. If it is weak, then you are more susceptible to getting sick and developing serious illnesses. If you were recently sick with a virus, then it is all the more important to get it revved back up to avoid the next virus that comes to town.

Fatigue is medically defined as a reduced ability to perform work and is a feeling of temporary or chronic tiredness, malaise and low energy. In most cases fatigue is caused by stress, overwork, poor nutrition and a lack of physical fitness and restful sleep.

Proper nutrition is important to health and vitality. Prolonged vitamin deficiencies can cause a variety of physiological issues. Vitamin B-12 is a water soluble vitamin that plays a crucial role in the healthy formation of red blood cells, tissues and DNA.

Allergies are a common condition that effects nearly everyone at some point in their lives. An allergic response is the result of the immune system's overreaction to an unknown particle or substance. Paint allergies can result from the inhalation of strong vapors or contact with the skin.

Lymph nodes are intricately involved in your body's immune response, contributing to your ability to fight off infections. Located in various regions of your body -- including behind your ears -- nodes fill with fluid when you are exposed to a bacteria or virus.

Fatigue is a feeling of exhaustion and weariness that does not go away with rest. Fatigue is not drowsiness that responds to a good night's sleep. Nausea is the feeling of sickness or discomfort in the stomach that produces the urge to vomit.

Scleroderma is a condition in which a type of connective tissue in the body called collagen is overproduced. It can be localized, leading to hardened patches or bands of skin, the tissue that lies immediately below the skin and sometimes the muscles of the arms, legs or forehead.

Almost everyone has some experience with fatigue and muscle aches as many conditions can cause these to symptoms to occur, including a new exercise routine.

Exercise is like a medication. In the correct dose, it can be beneficial, but in excess, it can be harmful. Different athletes have different tolerances for stress. A grueling workout for one person might be a routine workout for another.