Many illnesses can cause bloody phlegm, also known as sputum. According to Merck Manuals Online Medical Library, most of these causes are related to diseases and conditions of the respiratory system. Some of the illnesses that can cause bloody sputum are more benign than others.

Fasting hypoglycemia is a type of hypoglycemia, or low blood sugar, that occurs when the stomach is empty. Fasting hypoglycemia is diagnosed as a blood glucose level of less than 50mg/dL, according to the National Diabetes Information Clearinghouse.

Abdominal pain is a common complaint of pregnant women. They may be dismayed to find that the pain often continues at least for the first few days postpartum, sometimes even longer. In most cases, abdominal pain is a normal, transient response to childbirth.

Urine consists primarily of water, waste products and electrolytes filtered from the blood by the kidneys. It is typically clear and pale yellow with a slight odor. Urine composition, color and odor normally varies, often based on your diet and hydration status.

Serotonin is a neurotransmitter that has numerous physiological functions in the central nervous system. It is made from l-tryptophan, an essential amino acid found in many protein foods.

The human immunodeficiency virus--HIV--is a disease that causes progressive degradation of the immune system. As a result, patients with HIV are at a high risk of developing recurrent infections that can include gastrointestinal complications.

Subluxation -- a less than full dislocation of a joint -- occurs when movement of a joint goes beyond its maximum range causing the bones to move out of alignment. Subluxations commonly occur in the sacroiliac (SI) joint, which is formed by the bottom of your spine and your pelvis.

The U.S. Department of Health and Human Services reports that 51.6 percent of Americans describe themselves as current drinkers of alcohol. However, alcohol and certain medications can interact when ingested together.

If you ever experience itching or discomfort "down there," you might find that wearing different fabrics alleviates your symptoms. Depending on the circumstances, your doctor may recommend wearing cotton panties on a daily basis.

Cleansing detox fasts such as the Master Cleanse claim that fasting and drinking specialized concotions can cause your body to shed harmful toxins that have accumulated in your colon. Among these detox fasts is a liver cleanse created by alternative medical practitioner Andreas Moritz.

When you cut yourself or scrape the skin, the blood will flow freely at first, then slow and begin the process of forming a clot. Eventually the injury will scar over and heal. Large, deep cuts that lose blood easily or injuries to arteries can be very dangerous.

Of all bone and joint injuries to occur during physical activity, ankle fractures are among the most common. Injuries occur when too much stress is placed on the ankle joints. A sprain occurs if only the ligaments tear. When the bone gives way and breaks, it is called a fracture.