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Dementia does not come on suddenly. You described symptoms that frequently come on with UTI's. Call her doctor and get her in to be tested for a UTI and likely get antibiotics. You should not be diagnosing her but you should gain some knowledge of common afflictions that affect older women - and UTIs are near the top of that list.
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Reply to dkiely33
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Really sounds like a UTI or dehydration. Both of those conditions can come on quickly and silently before the symptoms you describe show up. The thing that has worked best for me is to call an Urgent Care Service in my area that does home visits and AL visits. She needs a urine test to culture whatever bacteria is in her urinary tract (if any) and she might need a bag of IV fluids to get her hydrated. They can do that at home.
If she is mobile, you can take her to an outside Urgent Care for this. If she can’t or won’t leave the house, try to find a mobile Urgent Care. If all else fails, get her to the ER. I have found televisits with her Primary Care to be pretty worthless to diagnose and treat these conditions since they really can’t prescribe the right antibiotics without a good urine sample. They can’t do an IV over the phone. Re hydration, I have used a mixture of orange Gatorade with her favorite juice to get some electrolytes in her and get her to drink it. She is usually a pretty good water drinker so that helps too.
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Reply to jemfleming
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More than likely she has a urinary tract infection. Elderly brains have a higher propensity of being affected by bacterial infections than others. She should be tested asap. If she won't go in do a virtual visit
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Reply to Kalamazootx1
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Could be a UTI. My mom use to get them all the time and act like your mom. You can by strips at a drug store to test her or just bring her to the doctor and they will test her urine. Also, my mom never had any other usual symptoms.
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Reply to Bruce1977
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Could be a UTI. My mom would get that way.
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Reply to Bruce1977
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It could be reaction to tablets - to pain - could be Delirium. Could be caused by dehydration. I dont think Dementia comes over night. I think you need to speak to your mothers doctor. Make sure shes drinking - a lot can be caused by dehydration.
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Reply to Jenny10
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Uti, or possibly dehydrated.
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Reply to Upnorthmi
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When my husband has very low BP he gets very angry. Can’t even suggest anything are he gets very upset. He ever talks to people or imagery characters. I call it jibber jabber.
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Reply to Kaytyson
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Summernole Apr 16, 2025
Also be aware that talking to imaginary people can be a sign of a serious UTI. I know, first hand, from when my Mom had a severe UTI and she was seeing people and creatures in our house. Talking to them. I thought it was an adverse reaction to a new medication so I took her to the ER. It was a severe UTI. The meds for the UTI were not working. There is an "at home" UTI test you can buy over the counter at a pharmacy. They are called AVO test strips for urinary health. This is just the first step. It is best to go to a lab and have a real urinary test done to make sure. Call his doctor's office and ask if they will fax in an order for the test.
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I totally agree with my2cents. Have her checked for a Urinary Tract Infection. I always know when my Mom has one when she gets confused.
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Reply to Summernole
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First thing I would have checked is urinary infection. That can cause exactly what you list as symptoms very, very quickly. A complete and total change in awareness, behavior, and communication from one day to the next.
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Reply to my2cents
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Another vote for UTI and a reminder to keep UTIs top of mind in this population. Don't know about others, but there were several times over the years when Mom would act erratically for a day or two before it suddenly dawned on me that it could be a UTI--like an "ah ha" moment.
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Reply to Clover409
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Wgrubb, you've been given some great information here. I hope you have been back to read the responses. Please give us an update on mom.
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Reply to graygrammie
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It may be a urinary tract infection. However, was her vision getting worse recently? Did she hit her head? All of this happened to my mom at 85.
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Reply to Onlychild2024
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Have her B12 level checked. My late husband experienced something similar and I was told to contact Alzheimer’s group for help. After neurologist ordered more blood work we found out his B12 level did not even register. After starting B12 injections he was much better cognitively.
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Reply to Morellok
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UTI get a urine sample tested asap.
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Reply to brandee
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When my mom has these symptoms it’s a UTI.
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Reply to Megcc24
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Dear Wgrubb,
Please let us know how your Mom's medical issues resolve. So many times folks post their question, but don't let us know the result. I'm hoping it is just a UTI.
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Reply to JanPeck123
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Talk to MD.
Read about dementia / Brain Changes.
Get books, watch You Tubes.
Are you jumping to a conclusion that her behavior is due to dementia ? (Why?)
- it could be from many other medical needs / reasons ... one as simple as not drinking enough water ... hormone changes ... all kinds of 'reasons'

First step is to contact her MD.
Is she on medication? perhaps it needs to be changed.
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Reply to TouchMatters
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Your mom could have a UTI. Bladder infections in younger people are usually quite painful so you know you have one, but for some reason frequently the elderly can’t tell if they have a UTI because there is no pain. The UTI causes confusion and strange dementia type of behavior. Have your mom checked and good luck.
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Reply to Specpondmom2
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Generally, no. Dementia is usually slow and progressive. Cognitive changes that are sudden need to be evaluated. Did she have trouble sleeping, eat/drink something known to cause problems (allergens come to mind), take any medications that can cause this as a side effect...? If the answer to those questions are no, take her to an Emergency Department. She may have an infection or a stroke. In the latter case, time is brain. The sooner she is treated, the better she will be.
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Reply to Taarna
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There has to be an underlying cause for sudden onset dementia. Most likely a UTI. But get her also checked for a TIA, commonly called a mini-stroke.
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Reply to JanPeck123
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Yes, my first response to your question was it very well might be a UTI.
Best to get her to an Urgent Care, her Doctor, or the ER.
best of luck; keep us updated :-)
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Reply to OnchiBaby1030
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Nurse here: Could be UTI. Or another infection. Could be stroke. I'd look into UTI first (urinary tract infection). They're "famous" for this change in status
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Reply to Sleepingbear
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No, but a UTI sure can. Have her checked out immediately.
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Reply to funkygrandma59
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No, Dementia progresses overtime. Mom could have had a stroke in her sleep. Like said, sugar levels could have spiked. Could be anything. Call her PCP and get her in now. Maybe even take her to the ER.
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Reply to JoAnn29
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BluegrassGirl Apr 10, 2025
This is an often overlooked cause of intense mood and personality changes! My mother had trouble with taking her diabetes medication and would forget to eat. Sometimes for days. It was scary how wild and crazy she could get. A neighbour once called me to come see because my mother was ranting and raving in their huge backyard for hours. They knew she didn’t drink but her crazy ranting was so similar to a very aggressive and drunk person. The paramedics were sure it was a stroke until the neighbour took over my mother’s medications and explained her diabetes and severe hyperglycemia and high blood pressure. They were good friends but my mother terrified the poor lady and threatened her with garden shears!
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Excessively high blood sugar can cause severe confusion.
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Reply to MG8522
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noramanwiller Apr 10, 2025
Yes! This happened for my mom. DKA episode. :(
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Are you speaking she is going back and forth within a diagnosed dementia or are you speaking of your mom was fine, shopping and cooking and all else and then went suddenly South for no reason?
We need more information, but start with a urinalysis here, and speak to your doc.
Best of luck.
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Reply to AlvaDeer
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You'll get a lot of questions about Mom. Guess I'll start. How old is she? Does she live alone, with you, assisted living? I ask this, because it helps to understand the dynamics of people's behavior. Living with you can mean you're personally affected by this. Visiting her at a facility, you're not as exposed to her behavior. Has she been recently hospitalized? There is hospital stay induced "dementia"-from what I've read, temporary. Although that may not always be the case. And the number one question will be-does she have a bladder infection?
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Reply to Ariadnee
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