Stagnant thinking means that the association is not easy to develop, showing obvious inertia, always entangled in the same problem. So let’s take a look at what are the causes of stagnant thinking. 1, brain degenerative diseases: certain cortical, subcortical diseases can cause dementia, common causes are Alzheimer’s disease, Pick’s disease, Huntington’s disease, Parkinson’s disease, hepatomegaly, cortical-striatal-spinal cord joint degeneration, etc. 2, cerebrovascular disease: different parts of cerebrovascular disease can cause dementia, such as multiple infarct dementia, carotid occlusion, subcortical arteriosclerotic encephalopathy, thromboangiitis, etc. 3, metabolic diseases: some metabolic diseases affect brain function and cause dementia, such as mucinous edema, hyper- or hypoparathyroidism, hyperadrenocorticism, hepatomegaly, uremia, chronic liver insufficiency, etc. 4, intracranial infection: intracranial infection leads to changes in brain parenchyma and brain function, resulting in dementia, such as various encephalitis, neurosyphilis, various meningitis, kuru disease, etc. 5, intracranial occupying lesions: tumors, subdural hematomas can cause structural and functional changes in the brain, leading to dementia. 6, hypoxia and hypoxemia: including ischemic (cardiac arrest, severe anemia and hemorrhage), hypoxic (respiratory failure, asthma, asphyxia, anesthesia), stasis (heart failure, excessive red blood cells) and tissue toxicity and other types of hypo (hypo) oxygenemia. 7, nutritional deficiency encephalopathy: thiamine deficiency encephalopathy, pellagra, vitamin B12 and folic acid deficiency, etc. 8, toxic diseases: common in carbon monoxide poisoning, lead, mercury and other poisoning, organic poisoning, etc. 9, cranio-cerebral trauma: open or closed trauma to the head, boxer dementia, etc. 10, other: normal pressure hydrocephalus, sarcoidosis, etc.