Blood clots in the stool usually signal bleeding in the colon. Common causes include diverticular bleeding and colitis, among others.

Blood clots form when your blood vessels are injured, which is part of the healing process and usually desirable, but sometimes the process clogs arteries and veins, forming thrombi. Thrombi are made mostly of a fibrous protein called fibrin, which is difficult to dissolve.

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.

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.

Blood clots are clumps of blood that form in the blood vessels and can travel into the heart, lungs and brain. Blood clots can cause conditions such as strokes, angina, arterial embolisms, deep vein thrombosis, heart attacks, pulmonary embolisms and renal vein thrombosis.

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.

Blood clots typically occur in the large veins of the legs but also can form in the arms and upper body. Also called deep vein thrombosis, or DVT, blood clots prevent normal blood flow and can cause swelling and pain at the location of the clot.

Blood clots deep in the legs, called deep venous thrombosis or DVT, are a serious health concern. If a clot breaks free and travels to the lungs, it can be potentially fatal. Blood clots in the lungs are the third leading cause of death in people who are hospitalized, according to the medical text "

Bleeding from the gastrointestinal tract is a fairly common occurrence and a frequent cause of emergency room visits, according to the textbook "Harrison's Principles of Internal Medicine." Hematemesis is the term used to describe vomiting blood, while hematochezia refers to bleeding from the rectum.

Nattokinase is an enzyme that can be used to prevent blood clots that are associated with strokes and heart attacks. Heart disease is the No. 1 killer of Americans, while stroke is No. 3. Nattokinase is derived from the Japanese soy food called natto that somewhat resembles blue cheese.

Blood clots are your body's way of healing wounds. Platelets in your blood respond to an injury, like a cut, by sticking together to stop the bleeding. Some foods affect the ability of your body to form a clot. These foods may thicken or thin blood.

The pH of your blood is normally between 7.35 and 7.45, just slightly above neutral. The term "pH" -- which stands for potential hydrogen -- gives you an idea of a substance's acidity or alkalinity. Strenuous physical activity is even a strain on your blood, which can cause your blood pH to drop or become more acidic.