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.
Bleeding that takes place in the esophagus, stomach, or the first part of the small intestine most often causes the stool to appear black or tarry. Your doctor may use the term melena.. Bleeding in the upper part of the GI tract will most often cause black stools due to: Abnormal blood vessels.