This suggests that people are born with a dislike of heights. However, most children and adults are a bit nervous around heights, but they don't have a phobia. Many scientists think that a phobia is a learned response to either a parent's fear of heights or a traumatic experience in childhood, like a fall. Show the video to your parents and friends.
Causes Of Melena. Black stool or melena causes include: 1  Peptic ulcer that includes stomach ulcer, duodenal ulcer. 2  Stomach cancer. 3  Patient on anti-coagulant drugs such as Warfarin may cause melena. 4  Gastritis (inflammation of stomach) and esophageal varices.5  Hemorrhagic blood disease such as purpura.ymptoms of melena or blood in stool are: 1  Patient complains change of stool color to his medical attendant; it is dark black like coal tar. 2  Anemia is most important sign noted in patients with melena.
Melena is associated with gastrointestinal hemorrhage, peptic ulcers, gastritis and other upper gastrointestinal tract disorders. The blood associated with melena gives stools a black, tarry appearance because blood is rich in a molecule called hemoglobin.iagnostic tests that might be performed include blood tests, stool cultures and X-rays. Testing the stools is important because in certain specific situations, stools can take on the appearance of melena even if no bleeding is present.