What Causes Short-Term Memory Loss? Common Reasons Explained

Spoiler alert: Scrolling isn’t helping anything.

No, it’s not you. It’s not your brain, either. It’s, as your parents said, that damn phone. The most recent research backs up something we already suspected; “high screen exposure is linked to reduced working memory accuracy…” among other negative effects. Technology is partly to blame, and smartphones are a convenient culprit. 

But when it comes to short-term memory loss causes, there are multiple other factors at play. Before we dive in, know that short-term memory loss happened long before the iPhone hit the market nearly 20 years ago (yes, it’s been that long). The good news: It’s something you can work on. 

TL;DR

Short-term memory loss causes include poor or inconsistent sleep, stress, anxiety, nutrient deficiencies, and prescription medications in some cases. Stints of mild forgetfulness are inconvenient, but not necessarily indicative of a more serious issue.

Key Takeaways

• Most short-term memory loss causes are common and treatable — sleep debt, stress, or simply doing too much at once and overloading your brain.
• Medications, alcohol, and low B12 or thyroid issues can dull recall as well.
• Some decline in memory  is normal with age; a sudden or worsening change is the part to take seriously.
• Memory loss that disrupts daily life warrants a check-in with your doctor.

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What Counts as Short-Term Memory Loss

Short-term memory loss is a mental “compartment” used for storing information you need on a regular basis, such as a phone number, two-factor authentication code, or your motivation for opening the refrigerator.

Is short-term memory the same as working memory? Not exactly — the Cleveland Clinic draws an important distinction:

• Short-term memory is storage space; you can’t manipulate the information stored within.
• Working memory is both short-term and malleable.

Short-term memory loss occurs in healthy individuals all the time. On its own, intermittent bouts of forgetfulness are normal and nothing to worry about, especially if you’re getting on in years. 

Organizations like the National Institute on Aging draw the line at practicality. If you’re regularly forgetting details that interfere with your day-to-day activity, you might want to take your memory lapses more seriously — whether you’re 28 or 82.

The Common Causes of Short-Term Memory Loss

Memory is complicated. Your brain constantly responds to the stimuli you provide it. Much like how one cheat meal won’t derail an entire diet, one night of poor sleep might make you feel a bit dull-witted the next day, but probably isn’t the cause of persistent memory issues.

Persistent exposure to multiple causes of short-term memory loss, however, can quickly stack up:

Sleep deprivation: A meta analysis of over 70 studies found a consistent relationship between lack of sleep and decreased attention span, critical thinking skills, and other cognitive domains.

Stress: Research shows that being stressed impairs working memory and cognitive flexibility, locking you into rigid thought patterns and narrowing your reasoning skills.

Anxiety: Studies show similar findings when examining anxiety. Anxiety can be particularly harmful — forgetting important details can create more anxiety, which worsens recall further, and so on.

Depression: Another systematic review found that depression leads to moderate impairment of executive function (your ability to take initiative and carry out tasks), working memory, and attention span.

Medication: Certain prescription medications can impair memory as a side effect, such as benzodiazepines and some opioid painkillers.

Alcohol: They call it “blacking out” for a reason; alcohol directly erodes short-term memory, and the severity of the effects scale tightly with how much you drink (and how fast).

Vitamin deficiencies: B12 issues in particular have evidentiary ties to cognitive impairment. 

Multitasking: Your brain is not capable of truly focusing on more than one thing at a time. Trying to stretch your mental bandwidth too broadly makes you more prone to distractions and blind spots in working memory.

Aging: Losing a bit of sharpness with age is unavoidable. Research shows that “fluid abilities,” such as mental processing speed, steadily decline from as early as age 20 onward. However, this so-called decline is mild and gradual, and only becomes noticeable for otherwise-healthy individuals after decades.

Short-term memory loss isn’t a light switch you flick with one late night at the bars, or a hard week at work. Lifestyle choices matter, but only after weeks and months. Many of these factors are course-correctable as well.

When Memory Loss Is a Red Flag

Forgetting an acquaintance’s name is normal. Scrambling for your best friend’s name is another story. Short-term memory loss can become a red flag when it interferes with daily living or if long-known information, such as the route to a location you regularly drive, becomes hard to recall. 

“Keeping a diary of memory loss before seeing a doctor may allow your doctor to assess your clinical condition with greater speed and accuracy.”

 

 

– Dr. Ryner Lai, MBBS

If memory loss is disruptive and/or sudden, don’t panic. There may be a completely innocuous or fixable cause. Still, play it safe and get in touch with your doctor for an evaluation. They’ll want to test for stroke, brain tumors, seizures, or head injury. That doesn’t mean you necessarily have something serious to worry about — medical professionals treat even mild memory-related conditions with almost excessive caution.

How to Support Short-Term Memory

Like most things relating to the body, memory is use-it-or-lose it. You can take precautions by changing certain lifestyle behaviors, but you’ll also want to give your recall skills a chance to develop.

• Prioritize sleep: Sleep deprivation is the best and most consistent way to chuck your cognitive skills in the gutter.
• Manage stress: Studies show that mindfulness techniques to manage stress make a noticeable impact on working memory capacity.
• Move often: Exercise gives your brain a break and has been shown to produce modest gains in executive function, attention span, and short-term memory, to a lesser degree.
• Monotask: Tackle tasks, chores, or problems one at a time. Multitasking feels productive on the surface, but leads to more stress and less articulate thinking patterns.

If you’ve made any recent changes to your medications, consult with your doctor to see if they have side effects related to short-term memory.

Frequently Asked Questions

Bottom Line on Short-Term Memory Loss Causes

When it comes to short-term memory loss, the usual suspects are sleep loss, high stress, volatile mood, drug or alcohol use, or vitamin deficiencies. These lifestyle factors are modifiable, and memory tends to improve when you take care of your health. But if your memory loss comes on abruptly, and is severe to the point of forgetting details you’ve known for years, you may want to get evaluated by a doctor.

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