Tearing up without a clear emotional trigger is surprisingly common, and it almost always has an identifiable cause. The explanation usually falls into one of two categories: your eyes are physically irritated and producing reflex tears to protect themselves, or your brain is processing emotions you haven’t consciously registered yet. Less commonly, a neurological condition can cause involuntary crying episodes that feel disconnected from how you actually feel inside.
Dry Eyes Are the Most Common Culprit
This sounds backward, but dry eyes are one of the top reasons people tear up for seemingly no reason. When your eye’s surface dries out, the irritation triggers a reflex that floods your eye with emergency tears. These reflex tears come in a sudden wave rather than the slow, steady film your eyes normally maintain, so you end up with watery eyes or tears rolling down your cheeks even though nothing made you cry.
Dry eye disease affects anywhere from 5 to 34% of the general population, with rates climbing as you age. Screen use is a major contributor. You normally blink about 14 to 16 times per minute, but during screen use that drops to as few as 4 to 6 blinks per minute. Each blink spreads a fresh layer of moisture across your eye, so fewer blinks means a drier surface, more irritation, and more reflex tearing. If your unexplained watering tends to happen during or after long stretches on a computer or phone, this is likely what’s going on.
Certain nutritional gaps can make this worse. Low vitamin D levels are consistently linked to dry eye disease, and supplementation has been shown to improve symptoms. Vitamin B12 deficiency can also contribute to dry, irritated eyes. One case study documented a 28-year-old with burning pain and a foreign body sensation in both eyes whose symptoms resolved completely after B12 supplementation.
Blocked Tear Ducts
Your tears normally drain through tiny openings in the inner corners of your eyes, flowing down into your nose (which is why your nose runs when you cry). When those drainage channels get partially or fully blocked, tears have nowhere to go and pool up in your eyes instead. The result is a persistently watery eye that can look and feel like you’ve been crying.
In adults, blocked tear ducts are usually caused by age-related narrowing, a past infection, or less commonly a small growth pressing on the drainage system. Older adults are at the highest risk. Along with constant watering, you might notice redness, crustiness along the eyelids, blurred vision, or recurring eye infections.
Hormonal Shifts and Emotional Processing
If the tearing feels more emotional than physical, meaning you feel a lump in your throat or a swell of feeling but can’t point to a reason, hormones and stress are the most likely explanations.
Estrogen plays a significant role in how your brain processes emotions. During low-estrogen phases of the menstrual cycle (particularly the days before your period) and during perimenopause, the brain structures involved in mood regulation become less active. Women in low-estrogen phases show a stronger negative mood response to stress and a greater cognitive bias toward negative information compared to high-estrogen phases. This means the same daily frustrations that barely register one week can bring you to tears the next, and it can genuinely feel like crying for no reason because the trigger seems too small to justify the reaction.
The menopause transition amplifies this effect. Estrogen and progesterone levels can swing dramatically during early perimenopause, sometimes for years, before settling into a stable low-estrogen state. These fluctuations create repeated windows of vulnerability where emotional reactions feel out of proportion.
Stress You Haven’t Named Yet
Chronic stress and emotional exhaustion can cause what some psychologists call “leaky” emotions. You might feel fine on the surface, but your nervous system is running on overdrive. Your brain interprets sustained stress as a survival threat and keeps pumping out stress hormones, which gradually erodes your capacity to regulate emotional responses. The result is tearfulness that seems to come out of nowhere.
Other signs of emotional exhaustion include irritability, trouble concentrating, low motivation, and a general sense of feeling unwell without a clear physical cause. The tricky part is that you may not even recognize what’s driving these feelings, especially if the stress has been building gradually over weeks or months. A demanding job, caregiving responsibilities, or ongoing relationship tension can all accumulate below your conscious awareness until your body starts expressing what your mind hasn’t processed.
Pseudobulbar Affect: When Crying Is Neurological
Pseudobulbar affect, or PBA, is a neurological condition that causes sudden, uncontrollable outbursts of crying (or sometimes laughing) that don’t match what you’re actually feeling inside. The episodes come on abruptly, last seconds to minutes, and then pass, leaving you back at your normal emotional baseline. They’re often triggered by something minor or by nothing at all, and they feel distinctly involuntary, as if the crying is happening to you rather than because of you.
PBA results from damage to the brain pathways that regulate emotional expression. It’s seen across a wide range of neurological conditions but is especially common in multiple sclerosis, stroke, traumatic brain injury, ALS, Parkinson’s disease, and various forms of dementia. The prevalence is striking: surveys have found PBA in roughly 48% of people with MS, 53% of stroke survivors, and 80% of people with brain injuries. Despite these numbers, PBA is frequently unrecognized or misdiagnosed as depression.
The key distinction is that depression involves persistent sadness, while PBA involves episodes of emotional expression disconnected from your actual mood. If you have a known neurological condition and find yourself crying (or laughing) in sudden bursts that feel completely out of your control, PBA is worth raising with your neurologist. Effective treatments exist.
Medications That Cause Tearing
Some medications list increased tearing as a side effect. Certain stimulant medications used for ADHD, for example, have been linked to increased tear production. Chemotherapy drugs are also well known for causing excessive watering of the eyes, sometimes by inflaming or scarring the tear drainage system. If your unexplained tearing started around the same time as a new medication, checking the side effect profile is a reasonable first step.
How to Tell What’s Causing Yours
The pattern of your tearing offers the best clue to its cause. If your eyes water most during screen time, in air-conditioned rooms, or on windy days, dry eye or environmental irritation is the likely answer. If the tearing is always in one eye and accompanied by crustiness or recurring infections, a blocked tear duct is more probable. If the episodes feel emotional and coincide with your menstrual cycle or a period of high stress, hormonal and psychological factors deserve attention.
Sudden, intense crying episodes that feel involuntary and disconnected from your mood, particularly if you have any history of neurological illness or head injury, point toward pseudobulbar affect. And if the tearing started after beginning a new medication, that connection is worth investigating. Most causes of unexplained tearing are manageable once identified, and simply understanding why it’s happening can make the experience far less unsettling.