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.
The causes of this kind of Melena are the same as when the stool is tarry. In addition, this type of Melena is also associated with anemia which is causes due to the loss of iron along with the blood.black, tarry, sticky and foul-smeling stool that is usually caused by gastrointestinal hemorrhage.elena can also occur due to bleeding ulcers. Ulcers are sores that develop in the lining of the stomach due to infection by Helicobacter pylori bacterium. Drug overdose can cause tarry stool as well. Prolonged use of pain relievers can irritate the stomach and cause stomach ulcers and melena.