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: Black, tarry stools with an offensive odour caused by an upper gastrointestinal bleed. See detailed information below for a list of 103 causes of Melena, Symptom Checker, including diseases and drug side effect causes.Â» Review Causes of Melena: Causes | Symptom Checker Â».elena: Black, tarry stools with an offensive odour caused by an upper gastrointestinal bleed. See detailed information below for a list of 103 causes of Melena, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Melena: Causes | Symptom Checker Â».