Because of the special physiological and pathological characteristics of the elderly. Therefore, the elderly have their own special characteristics of disease. Roughly including the following points: First, the elderly often suffer from a variety of diseases at the same time an elderly often suffer from a variety of diseases at the same time. According to statistics, the average elderly at the same time with 4 to 6 diseases or more, such as an elderly can be at the same time with hypertension, coronary heart disease, hyperlipidemia, cervical spondylosis, mild cataracts, lumbar strain and so on. Although these diseases exist in people at the same time, but there is always a difference in the severity of the different, of which there must be 1 to 2 for the main disease, the harm is great, and even fatal danger. Second, the elderly are prone to comorbidities comorbidities refers to when suffering from a certain disease, in the disease on the basis of complications of other diseases. As the immune function of the elderly decreases, resistance is poor, and resistance to external microorganisms and other stimuli is weak, so the elderly are more likely to have comorbidities than the young when they are sick. For example, the elderly are prone to pneumonia, such as stroke coma, post-surgery or fracture bedtime are prone to pneumonia. Third, the elderly are prone to water and electrolyte disorders when they fall ill. The normal human body needs a certain amount of water and necessary electrolytes, such as potassium, sodium, chloride, etc., in order to meet the needs and balance of the body’s metabolism. Due to the elderly body intracellular fluid reduction, cell function degradation, organ atrophy, once the fever or vomiting, diarrhea, it is easy to water and electrolyte disorders. Fourth, the elderly disease symptoms are not typical, not obvious elderly due to the body type changes and function of the lower, weakened responsiveness to the pain and disease response is not as sensitive as children and young people. For example, in the back of the teenagers should be sick when the high fever response in the elderly but due to the weakening of the response to the performance of a low fever or no fever. Another example is that when the elderly suffer from myocardial infarction, they seldom have severe chest pain like middle-aged people, but they almost have no pain or only show a slight sense of chest tightness. Therefore, the elderly often can not clearly explain their own pain and discomfort, or vague expression. Fifth, when the elderly are sick, especially when the acute disease, easy to occur consciousness disorder and mental abnormality due to the elderly cerebrovascular atherosclerosis, cerebral blood supply is insufficient, when infection, fever, dehydration, arrhythmia, etc., easy to sleep, delirium, talking nonsense, confusion, or even coma and other symptoms. This is due to lack of oxygen to the brain. Some diseases may take sudden coma as the main manifestation. Sixth, the onset of disease in the elderly fast, easy to occur systemic failure of the elderly organ reserve function is low, once the stress, the rapid deterioration of the condition, easy to quickly after the onset of failure. The so-called “death of the old” is actually not disease-free, for the original barely balanced state of some organs in a state of rapid failure and involves a number of organ damage. Seven, the elderly after the disease recovery is slow, poor also due to the elderly function decline, often not easy to recover from the disease, or recovery is slow, and even a lot of diseases still leave sequelae, often need to take rehabilitation measures. Eight, when the elderly are sick, their reaction to drugs is bigger. When the elderly are sick, if they use too much medicine or improper dosage, together with the reaction of the elderly themselves to the drugs, it is very easy to have toxic reaction to the drugs, or even aggravate the condition due to the reaction to the drugs, or make their health threatened. Elderly cancer patients have negative psychological characteristics, such as fear, anxiety, pessimism and disappointment, loneliness and depression, stubbornness and dependence, etc. Elderly diabetic patients in the early stage of admission to the hospital showed fear, chagrin, anxiety, disappointment and other psychological characteristics, the treatment of the disease is worried about whether the disease can be improved and the emergence of pain, anxiety, mental, elderly people with the age of the increasing trend of growth of mild depression, and the severity of depression will increase gradually, for the patients with The types of psychological disorders of patients with psychological disorders in the recovery period of stroke were analyzed, and all of them were dominated by paranoia. Elderly patients have psychological characteristics such as anxiety, fear, loneliness, depression, paranoia, irritability, inferiority complex, and self-abandonment. Therefore, nursing care for elderly patients should focus on nursing safety and psychological care for elderly patients.