By Lynn A. Morris,

Because they have similar symptoms, it can be difficult to distinguish among dementia, depression, and dilirium, according to home health authorities.

"People often make statements as 'Dad's going nuts', or 'Mom's lost her mind', and people don't recognize the treatment that might be available to help a loved one," said John Buckles, president of Home Helpers, a provider of non-medical compassion and personal care services. "If you sense a change in a loved one's behavior, pursue medical attention to find out what treatments might be available."

Dementia describes disorders that affect the fuctioning of the brain, and is characterized by mental decline and impairment. People with dementia often lose the ability to perform everyday tasks necessary to live independently. It is common for a person with dementia to say things like, "that's fine with me," or "I'll have what you're having," to cover up their struggle.

Depression is a mood disorder that can affect both a person's mind and body. It can be characterized by intense sadness that lasts for two weeks or longer, and impacts a person's ability to lead a normal life.

Delirium is not a disease, but a cognitive or mental disorder that appears suddenly, often within hours or days, and may come and go throughout the day.

A person who is delirious often appears disoriented, exhibits varying levels of consciousness, has disorganized speech, and an inability to comprehend what is being said. It also causes those affected to act unpredictably and to be uncooperative and/or violent.

"If you notice any change in a loved one's behavior, regardless if it is sudden or gradual, seek medical attention so that you may treat their medical condition and improve their quality of life," advises Charles Punchto, a principal of Aging America Resources.