Sudden extreme fatigue in older adults may be caused by many aspects.
It’s normal for seniors to be tired. However, this is very different from feeling tired at the end of the day and waking one morning with no obvious cause for tiredness and lacking the ability to get out of bed.
The second type is not sufficiently discussed. Older families attribute it to the natural aging process.
In the interim, the root cause remains unaddressed for weeks or months.
If a senior citizen suffers from sudden and severe fatigue, it’s typically because of a specific issue. The most frequent causes are listed below, along with what to watch for with each one of them.
It Is Not Just Age
The aging of the body is a gradual process and will not usually make someone collapse in exhaustion overnight. If it comes on rapidly, then the speed itself is a sign of fatigue. The body is reacting to something.
Tiredness that slowly happens over several years is not the same as suddenly dropping levels of energy within a couple of days or weeks.
When an older adult who once was able to cope with their schedule suddenly hits a wall, it’s not something that should be taken lightly.
Thyroid Problems Are Underdiagnosed More Than They Should Be
One of the most common and often undiagnosed causes of sudden fatigue in the elderly is an underactive thyroid. The thyroid controls the body’s energy production and utilization. When it slows down, everything else does too.
The hard part is that hypothyroidism mimics normal aging. A person feels cold more than usual, thinking gets hazy, weight increases slightly, and is always tired. Those symptoms can be confused with what aging does to you, and the thyroid is not checked until the condition gets much worse.
Anemia Upsets Energy
Without an adequate number of healthy red blood cells, the body can’t carry enough oxygen to where it is needed. The outcome is fatigue that does not get better with rest because the problem is not rest, it’s fuel.
The elderly are particularly susceptible to anemia due to several factors. As people age, their appetite may decrease, resulting in low consumption of iron or B12. There are certain medicines that can affect the way nutrients are absorbed into the gut. Over time, chronic diseases can also cause the body to make fewer red blood cells, such as in kidney disease.
If you are feeling tired, consider these signs that anemia could be to blame:
- The color of the skin is paler than normal
- Difficulty breathing while carrying out activities that were not challenging before
- Unsteadiness on the feet when standing up
- Can’t help feeling cold in warm rooms
- All day, every day fatigue that doesn’t improve with more sleep
The Heart Gives Signs of Warning Before Any Noticeable Change Occurs
Fatigue is a symptom that may present years before any other symptom or indicator of a heart condition, such as shortness of breath or chest pain.
There is inadequate circulation when the heart is not pumping well. This will manifest as fatigue first.
In older people, all of these can increase, and all of them are well known to be associated with sudden, unexplained fatigue: heart failure, irregular heart rhythms and coronary artery disease.
If swelling in the legs or ankles, difficulty breathing when lying flat, or general heaviness occurs, cardiac causes should be excluded early.
Symptoms of Infection Vary in Older Adults
A 35-year-old infected with UTI is most often aware of it. An 80-year-old person who has the same infection might only have fatigue and slight confusion, no fever, no burning and no apparent reason.
This is a known phenomenon in geriatric medicine. Older people’s immune system doesn’t go into the same frenzy when fighting infection, so the symptoms are either less marked or not seen. Finally, the most obvious message is fatigue.
Respiratory, skin, and dental infections occur in a similar manner. Sudden fatigue, along with confusion or behavior changes, should be considered one of the first factors to be evaluated in an infection.
Medication: A Serious Look
Many older people are on multiple medications. If a new dose is added or two medications begin to interact in a new way, fatigue can be one of the first signs.
Some drugs commonly associated with tiredness in older adults:
- Beta-blockers, medications used to treat high blood pressure or heart disease, can make people feel tired during the day because they make the heart beat more slowly
- Benzodiazepines and sleep aids may have a longer half-life in older systems than in younger ones, and the grogginess may persist through the next day
- Diuretics can cause the loss of potassium and sodium, which can lead to actual weakness
- Some antidepressants, particularly when they are first prescribed or if their dose has been raised
- Antihistamines, including those available without prescription, which in elderly patients are more sedating than indicated on the label
If fatigue occurred around the same time a medication was changed or introduced, then that association should be discussed with the prescribing physician or pharmacist who has access to the complete list of medications.
Depression in the Elderly Is Often Unnoticed
In older people, depression doesn’t always present as sadness. It sounds more like fatigue than exhaustion.
They lose their appetite for food. They do very little during the day, not because they are lazy, but because they have little energy and desire to do anything.
As people grow older, they experience actual and substantial losses. The spouse, siblings, and independence.
Such a lot of grief is burdensome. If it does not get processed, it can find its way into the body as fatigue.
Loneliness compounds this. A common complaint from older adults who are socially isolated is fatigue. Depression is more common than most people think in this group, and it’s also vastly underdiagnosed, with its symptoms being chalked up to physical deterioration.
Depression can be a cause of fatigue if:
- Low energy is most evident in the morning and a bit better later in the day
- Decreased appetite
- Pulling away from people and things that used to matter to them
- Getting irritable over small things, or going completely flat with no reaction at all
Sleep Quality Is Usually Worse Than It Looks
A lot of older adults will tell you they sleep fine. They go to bed, they stay there, they wake up in the morning. What they don’t realize is that hours in bed and actual rest are two very different things.
Sleep apnea is one of the biggest culprits here, and it goes undiagnosed far more than it should. The person stops breathing, starts awake, stops breathing again, all night long. They have no memory of any of it. They just wake up exhausted and cannot figure out why.
Then there is the pain. Arthritis, nerve pain, stiff joints. These wake people up every couple of hours whether they register it or not. Toss in a bathroom trip or two, some anxiety that makes it hard to settle back down, and by morning the sleep has been so broken it barely counts.
Fixing the sleep often does more for energy than anything else on this list.
Low Nutrients and Quiet Dehydration
Food becomes less interesting with age. Cooking for one is a lot of effort for not much reward. And because the sense of thirst also fades, many older adults spend most of the day mildly dehydrated without ever feeling particularly thirsty. That alone causes tiredness and mental fog that people chalk up to a dozen other things.
Nutrient gaps that directly drain energy:
- B12, which the body starts absorbing poorly as it ages and which keeps both energy and brain function running properly
- Vitamin D, especially in older adults who are mostly indoors
- Iron
- Magnesium, which plays into both muscle function and how well they sleep
Basic bloodwork catches most of these. And most of them are not hard to fix once someone actually looks.
When to Stop Waiting and Get Help
If the fatigue came on fast, has not let up, and is changing how an older adult gets through their day, that is not something to sit on. It needs a real look, at physical health, mental health, medications, sleep, nutrition, the whole picture together.
At IHAWS in Wilmington, Delaware, that is exactly what the team does.
We provide psychiatric evaluations, counseling, medication reviews and telehealth for anyone who finds getting to a clinic difficult.
Fatigue this persistent is telling you something. It’s worth listening to.
Reach out to IHAWS at ihaws.org to book an appointment. Bring the medication list, flag when things changed, and let the team get to the bottom of it with you.