You wake up at 2 AM and the sheets are damp, or you’re just aware that you’re lying there sweating for no obvious reason. It happened last week too. You turn the thermostat down. You switch to lighter bedding. The temperature in the room feels fine. You still wake up sweating.
Night sweats in men get less attention than in women, partly because perimenopause is such a dominant framework for understanding night sweats that when men have them, people don’t always think to ask why. But night sweats in men are common and very often fixable once you identify the cause.
How Men’s Night Sweats Differ From Women’s
The most important difference: hormonal fluctuation isn’t the primary driver in men the way it is in women.
In women, night sweats are most commonly caused by fluctuating estrogen levels during perimenopause and menopause. The hormonal framework is central to the diagnosis.
In men, the causes are more varied and tend to fall into lifestyle, medication, specific medical conditions, and anxiety categories. Hormones can be a factor (low testosterone), but it’s one of several causes rather than the default explanation.
This matters for investigation. If you’re a man with night sweats, running through a list of causes looks different from the investigation that works for a perimenopausal woman.
The Most Common Causes in Men
Anxiety and Chronic Stress
This is among the most common causes and the most underrecognized. The sympathetic nervous system, the same system responsible for fight-or-flight, activates sweat glands through cholinergic nerve fibers. During waking hours, chronic anxiety keeps this system running hotter than it should.
During sleep, the system is supposed to downregulate. But in people with significant anxiety or chronic stress, the sympathetic nervous system doesn’t fully quiet down. The body can remain in a low-level vigilance state even during sleep, which manifests as elevated heart rate, lighter sleep, and sweating.
Men are less likely to identify their symptoms as anxiety-related or to seek treatment for anxiety, which means this cause often goes unaddressed for years while other explanations are pursued.
If your night sweats correlate with stressful periods (a demanding work period, relationship conflict, major life transition), anxiety is very likely a significant contributor.
Alcohol
This one is straightforward and very common. Alcohol has several mechanisms that promote night sweating:
It causes vasodilation, raising skin temperature and triggering thermoregulatory sweating. It disrupts normal sleep architecture, preventing deep sleep and causing more arousal events during the night. It causes a rebound effect as it’s metabolized: blood alcohol rises then falls during the night, and the drop in blood alcohol can trigger sympathetic activation and sweating.
Men in general drink more than women, which partly explains why alcohol-related night sweats appear more often in men. Even moderate drinking in the evening (two or three drinks with dinner) can cause night sweating in susceptible individuals.
The test is simple: cut out evening alcohol for two weeks and see if the night sweats improve. If they do, you have your answer.
Sleep Apnea
Sleep apnea is significantly more common in men than women. It causes repeated episodes of partial or complete airway obstruction during sleep, leading to oxygen drops and abrupt sympathetic nervous system surges as the body rouses itself enough to restore airflow.
These sympathetic surges are physiologically identical to stress responses and activate the same sweating mechanism. Men with undiagnosed sleep apnea often report night sweating as one of their primary complaints alongside snoring and daytime fatigue.
If your night sweats are accompanied by any of: loud snoring, waking up unrefreshed, falling asleep easily during the day, morning headaches, or your partner reports you stop breathing during sleep, pursue a sleep study. Sleep apnea is highly treatable (CPAP is the standard; other options exist), and treating it typically resolves the associated night sweats.
Medications
A significant list of common medications cause night sweats as a side effect:
Antidepressants. SSRIs (like sertraline, fluoxetine, escitalopram) and SNRIs (like venlafaxine, duloxetine) are among the most common medication causes of night sweats. The sweating side effect is dose-dependent for many people. If you started an antidepressant and then began having night sweats, this is very likely the cause.
Blood pressure medications. Some calcium channel blockers and beta-blockers cause night sweating. The mechanism varies.
Steroids. Oral or injectable corticosteroids (prednisone, for example) cause sweating as a side effect and can disrupt normal sleep-sweat patterns.
Hormonal medications. Anything affecting testosterone or estrogen levels, including some prostate medications.
Niacin and aspirin. At high doses, both cause flushing and sweating.
If you started a new medication around the time your night sweats began, that’s the first thing to investigate. Talk to the prescribing doctor about alternatives or dosing adjustments.
Low Testosterone
Low testosterone (hypogonadism) can cause hot flashes and night sweats in men, a direct parallel to the estrogen-related symptoms in women. This is more common in older men (testosterone naturally declines with age) and in men who’ve had:
Androgen deprivation therapy (used in prostate cancer treatment). Chemotherapy or radiation. Pituitary conditions affecting hormone regulation. Prolonged significant stress (which suppresses testosterone).
Night sweats from low testosterone are often accompanied by other symptoms: decreased sex drive, fatigue, mood changes, decreased muscle mass. A blood test for total and free testosterone is a straightforward starting point.
Infections
This is less common as a primary cause but worth including for completeness. Certain infections cause night sweats as a prominent symptom:
Tuberculosis. HIV (particularly untreated). Bacterial infections including endocarditis (heart valve infection) and osteomyelitis (bone infection). Some fungal infections.
The sweating from infectious causes is typically accompanied by other symptoms: fever (even intermittent), weight loss, fatigue, and other systemic signs. If night sweats are your only symptom and they’re not severe, infection is less likely. If they come with unexplained weight loss, fever, or significant fatigue, investigate.
Idiopathic Hyperhidrosis
Some men just sweat a lot at night without a clear identifiable cause. Primary hyperhidrosis can have a nocturnal component, though it typically affects the hands and feet during sleep more than causing true drenching night sweats.
What to Do About It
Start with the lifestyle causes because they’re common, fixable, and require no medical intervention:
Cut evening alcohol for two weeks. If the sweating improves, you have a clear cause and a clear solution.
Assess your stress and anxiety levels honestly. If you’re under significant chronic stress, this is probably a contributor. Treat the stress.
Review your medications with your prescribing doctor. If you started a medication and then started sweating, mention this directly.
If you have other symptoms of sleep apnea (snoring, daytime fatigue, unrefreshed sleep), pursue a sleep study.
If lifestyle causes are ruled out and the sweating is significant, see a doctor for blood work: testosterone levels, thyroid function, CBC. This screens for the most common hormonal and infectious causes.
When to See a Doctor Sooner
The combination that should prompt a prompt medical appointment: night sweats plus unexplained weight loss plus fever. This triad is associated with lymphoma and some other serious conditions. Any one of these alone is often benign. All three together warrants investigation.
Other prompts for earlier evaluation: night sweats that started suddenly in someone who never had them, sweating severe enough to soak through bedding every night, or any accompanying symptoms (swollen lymph nodes, rash, significant fatigue).
For most men reading this, the cause is one of the common ones: alcohol, anxiety, sleep apnea, or a medication. Start there.
→ Night Sweats: The Full Guide → Waking Up Sweating: What’s Going On → Night Sweats: When to See a Doctor
Practical Night Sweat Management for Men
Before you see a doctor, run through the environment and lifestyle checklist. A large portion of night sweats in men resolve when you fix one or two variables. Start here.
The environmental checklist
Room temperature matters more than most people realize. Your body needs to drop its core temperature to initiate and maintain sleep. If your room is above 68°F, you’re fighting that process all night. Get the room to 65-67°F if you can. It makes a real difference for most people, not just those with night sweats.
Bedding is the other major variable. Synthetic materials trap heat. Polyester sheets and heavy comforters create a warm microclimate around your body that keeps your temperature elevated. Switch to percale cotton or linen. They breathe. A lighter duvet, or simply removing the top layer, is a low-effort experiment worth trying first.
Sleeping attire follows the same logic. Loose, lightweight cotton or moisture-wicking fabric beats anything synthetic or anything that fits close to the skin. Some men sleep better with less or nothing at all, which removes the variable entirely.
The lifestyle checklist
Alcohol timing. If you’re drinking in the evening, the question isn’t just whether you drink but when. Alcohol metabolizes over several hours and causes a rebound sympathetic activation as blood alcohol drops. A drink at 10 PM is still affecting your body at 2 AM. Try a two-week experiment: no alcohol within four hours of bed and see if the sweating improves.
Exercise timing. Late-night intense exercise raises core body temperature and keeps it elevated for one to two hours afterward. If you work out hard and then go to bed within an hour or two, your core temp hasn’t fully dropped yet. Shift workouts to morning or early afternoon if you can. If evening is your only option, allow more time between finishing and bed.
Pre-sleep meal size. A large meal close to bedtime triggers digestive processes that generate heat and keep metabolism active. This isn’t the biggest factor for most men, but it contributes. Eat heavier meals earlier and keep anything within two hours of bed light.
When to actually see a doctor vs. optimize the environment first
Try the environmental and lifestyle adjustments for two weeks before making a doctor’s appointment. If you’re drinking nightly, exercising late, and sleeping under a heavy polyester comforter in a 72°F room, you have things to fix before pursuing a diagnosis.
See a doctor sooner if: the night sweats are severe enough to soak through sheets regularly, they started suddenly with no identifiable trigger, or they’re accompanied by unexplained weight loss, fever, or swollen lymph nodes. That combination doesn’t wait for a two-week lifestyle experiment.
If you’ve cleaned up the environment and lifestyle variables and the sweating continues, blood work is the right next step. Your doctor will likely check testosterone, thyroid function, and a standard panel. That’s a 20-minute appointment and a blood draw. Most of the common medical causes show up clearly.
Sources
- Night Sweats: Overview, Cleveland Clinic
- Prevalence of night sweats in primary care patients, NCBI PMC
- Hyperhidrosis: Diagnosis and Treatment, American Academy of Dermatology
- Low testosterone (male hypogonadism), Cleveland Clinic