General:
lzheimer's disease is a degenerative disease affecting the brain areas that control memory, intelligence and the capacity of law, language and behavior, these being the most important Alzheimer's disease symptoms. This disease is most common form of mental decline or dementia in older people. Alzheimer's disease is a condition more serious than mild memory loss that occurs in older people. This disease is associated with behavioral disorders, personality, loss of ability to think properly and ability to perform daily activities. Close people, family members usually notice changes at first, although these changes can be seized by the sick.

-Risk Factors:
Old age is the most important risk factor. Other risk factors for developing Alzheimer's disease are:
- Family history of Alzheimer's, especially if the disease has appeared in first degree relatives (mother, father, siblings) and appeared in several family members
- This gene for apolipo-protein E-4, especially to those who are whites or Asians, increases the risk of developing disease Alzheimer
- Down syndrome, a genetic disorder that causes mental retardation
- Diabetes, a disease that accompanies high blood sugar
- Hormone replacement therapy. A recent study showed that the risk of developing dementia, including Alzheimer's disease is increased in women over 65 who are in substitute therapy with estrogen and progesterone.



Several theories have been raised about the increasing risk of developing Alzheimer's disease. These theories include the following factors:

- Smoking. Some researchers have suggested that smoking would increase the risk of developing dementia and Alzheimer's disease, but these assumptions were not confirmed.

- Blows to the cephalic region. There is evidence supporting that a coup in the cephalic region (the head) followed by loss of consciousness, may increase the risk of developing Alzheimer's later. Chances of developing the disease are increased if the injury is severe and patients have family history of Alzheimer's disease.

- High blood levels of homocysteine. Homocysteine is an amino acid normally present in small quantities in blood. High levels of this amino acid are accompanied by increased risk of heart disease. Some researchers argue that increased levels of homocysteine were associated with an increased risk of Alzheimer's disease. These levels of homocysteine are caused by low blood levels of vitamin B12 and folic acid. Daily exposure to aluminum from the pot, aluminum cups, and aluminum deodorants wasn’t demonstrated that it increases the risk of developing Alzheimer's disease symptoms.



-Causes:
It is not known for sure what causes the disease because Alzheimer, but it’s possible to see several reasons. Some of the damage caused to certain brain areas are related to loss of neurons by chemical messengers (neurotransmitters) mainly acetylcholine, allowing neurons to function normally. Nobody knows for sure the cause of these changes, but there are research to determine this case. Although most patients with Alzheimer disease in family history have the disease, risk of this disease is higher in people who have a family member suffering from Alzheimer. Some studies have suggested that zinc and aluminum would have a role in causing disease, but they were not supported by evidence to support these theories.