A steadier ground guide to tears that arrive without a story attached. Two things before anything else: if this appears alongside facial drooping, slurred speech, sudden weakness, or a severe headache, call 911, that's a possible stroke. And if she ever says she wants to die or doesn't want to be here anymore, that's a same-day call and a 988 call, not something to wait out.
Notice your own instinct to fix it fast, to find the thing that's wrong and solve it. Catching that instinct is the first move, before it turns into a search she can't help you finish.
Before anything else: check for pain. Once someone can no longer describe pain in words, crying becomes one of the more common ways it shows up, so look for grimacing, guarding a specific part of the body, or resistance to being touched somewhere. Hunger, fatigue, and overstimulation belong on that same short list, and so does a too-warm or too-loud room, since sensory overload alone can produce tears with nothing deeper behind them.
If those come up empty and this is a repeating pattern, brief episodes that start and stop abruptly, unconnected to anything sad that you can identify, what's often behind it is pseudobulbar affect, also called emotional lability: episodes of crying or laughing that don't match what's actually being felt inside, caused by damage to the brain circuit that normally regulates emotional expression. It's common after strokes and shows up in several forms of dementia, most often vascular dementia and Alzheimer's disease in later stages. Estimates in Alzheimer's disease range from roughly ten to forty percent, a wide range that reflects how often it goes unrecognized or gets mistaken for depression rather than a true rate.
The distinguishing features matter, and they're worth watching for even though only a clinician can make the actual call. Pseudobulbar affect episodes are brief, typically seconds to a few minutes, and stop as suddenly as they started. She may not describe feeling sad afterward, or may not acknowledge the episode happened at all, and a specific tell worth watching for is a laughing spell that flips into a crying one, or the reverse, within the same short window, since that pairing is characteristic of pseudobulbar affect and much less typical of depression. Her mood between episodes generally doesn't stay low.
Depression, by contrast, persists across days or weeks, comes with reduced interest, appetite or sleep changes, and is present nearly every day rather than in short bursts. Depression is also common in dementia, it affects a meaningful share of people living with the disease, and it is treatable, so the goal here isn't deciding the crying is "nothing." It's naming which of the two this actually is for the clinician, since the two are treated differently, and telling them what you've noticed between episodes, not just during them, is often what makes that distinction possible.
Rule out pain before anything else, since it's the most common and the most fixable driver once verbal report is gone.
Note how long each episode lasts, whether laughing spells happen too since they're part of the same spectrum, and whether her mood between episodes stays generally okay or stays low. Brief and unconnected points one direction. Persistent low mood across most of the day points toward depression, and that distinction is worth bringing to the appointment rather than resolving alone.
Some tears are just tears the brain produces without a reason attached, and not finding the reason isn't a failure on your part. You are not required to solve every wave that passes through her. Sometimes staying next to her while it passes is the whole job.
This is what the tracking is for. Dates, times and specifics turn "something's off" into something a clinician can act on in a ten-minute appointment.
Dextromethorphan-quinidine (Nuedexta) is FDA-approved specifically for pseudobulbar affect, if that's what the pattern points to after a clinician differentiates it from depression. Naming the term gives you language for it if it's brushed off as "just part of dementia." If you want to talk any of this through with someone first, the Alzheimer's Association runs a free 24/7 helpline at 1-800-272-3900.
A calm five minutes beside her counts as care, even when nothing gets explained and nothing gets fixed.