Overview
Dementia is a term for a decline in mental abilities severe enough to interfere with everyday life. It can affect memory, reasoning, communication, attention, and behavior. Dementia usually develops gradually, but the pattern and symptoms can vary from person to person depending on the cause.
Key Symptoms
Common symptoms include increasing memory problems, trouble finding words, getting lost in familiar places, difficulty managing money or medicines, and poor judgment. Some people also have changes in mood, personality, sleep, or behavior. As dementia progresses, a person may need more help with daily tasks such as dressing, eating, or personal care.
Causes and Risk Factors
Dementia can be caused by several brain diseases and conditions, including Alzheimer’s disease, vascular dementia, Lewy body dementia, and frontotemporal dementia. Risk factors include older age, family history, high blood pressure, diabetes, smoking, physical inactivity, and stroke. Heavy alcohol use, head injury, and poor heart health may also raise risk. Some conditions can cause similar symptoms and need to be checked, such as depression, medication side effects, vitamin deficiency, thyroid problems, or infections.
Who Is Affected
Dementia mainly affects older adults, but it can also happen in younger people. It occurs in people of all backgrounds and in every region of the world. Family members and caregivers are often deeply affected because support needs can increase over time.
Prevention
Not all dementia can be prevented, but some steps may help lower risk. These include managing blood pressure, diabetes, and cholesterol; staying physically active; not smoking; limiting alcohol; protecting the head from injury; and staying socially and mentally engaged. Hearing care, good sleep, and treatment of depression may also support brain health.
Diagnosis and Tests
There is no single test that diagnoses all dementia. A healthcare professional usually asks about symptoms, daily functioning, medicines, and medical history, and may do memory and thinking tests, a physical exam, blood tests, and brain imaging. Early evaluation matters because some causes are treatable and support planning can begin sooner.
Treatment Categories
Treatment depends on the cause and the person’s symptoms. Care may include medicines for some types of dementia, treatment of related conditions, support for sleep or mood problems, and practical steps to improve safety and daily routines. Cognitive support, rehabilitation, caregiver education, and community services can also be important parts of care.
Living With It
Living with dementia can be challenging, but routines, clear communication, labeled items, reminders, and home safety changes may help. Families often benefit from planning ahead for driving, finances, legal matters, and future care preferences. Caregivers may need respite, support groups, and help from health and social services.
When to Seek Medical Care
Seek medical care if you or someone close to you has worsening memory, confusion, language problems, personality changes, or trouble doing usual tasks. A prompt assessment is also important if symptoms appear suddenly or become noticeably worse over a short time. New confusion should never be ignored, especially in an older adult.
When It May Be an Emergency
Get urgent medical help right away for sudden confusion, sudden weakness, trouble speaking, severe headache, chest pain, breathing trouble, a major fall or head injury, seizures, or if the person is hard to wake. These problems may be caused by stroke, infection, injury, medication effects, or other medical emergencies rather than dementia alone.