Feeling slow thinking may be caused by Alzheimer’s disease, depression and other diseases. 1. Alzheimer’s disease: refers to serious and persistent cognitive impairment, dementia syndrome is more insidious, early memory loss as the main feature, patients may appear slow thinking, poor judgment, computational difficulties and other phenomena. 2. Depression: caused by psychological, genetic, social factors, the core symptom of depression is depressed, patients may appear sullen, pessimistic and despairing, silent and so on, accompanied by slow thinking, pessimism and other manifestations, and some patients may also appear sleep disorders, loss of libido and other symptoms. When the patient appears the above symptoms, should promptly go to the hospital for consultation, under the guidance of the doctor, standardized treatment.