Night sweats in men are common and usually tied to something identifiable: a medication, a sleep environment issue, a hormonal shift, or an underlying condition that raises your body’s thermostat. The fix depends entirely on the cause, so the most effective approach is working backward from what’s triggering the sweating in the first place. Here’s how to narrow it down and what actually helps.
Check Your Bedroom Setup First
The simplest explanation is often the right one. Sleep experts recommend keeping your bedroom between 60 and 68 degrees Fahrenheit for optimal sleep. Research published in the Journal of Thermal Biology found that people slept poorly once room temperatures climbed above 77 degrees, but the comfort window also depended heavily on bedding weight. With a thinner duvet, the comfortable range was narrow, roughly 62 to 72 degrees. With a heavier duvet, people tolerated rooms as cold as 46 degrees but needed to stay below 64 to avoid overheating.
If you’re waking up drenched, start here before investigating medical causes. Switch to lighter bedding, lower the thermostat, or use a fan. Wear loose, breathable sleepwear made from natural fibers like cotton or bamboo, or synthetic moisture-wicking fabrics designed to pull sweat away from your skin. These changes alone resolve the problem for many men, especially those who sleep with a partner (two bodies generate significant heat under shared covers).
Alcohol, Caffeine, and Spicy Food
Alcohol is one of the most common and most overlooked triggers. It increases your heart rate and widens blood vessels in your skin, both of which trigger sweating. For men with a genetic mutation that limits their ability to break down toxins in alcohol (a condition called alcohol intolerance), even small amounts can cause flushing and heavy night sweats. The effect is dose-dependent: the more you drink, the worse it gets, and drinking within a few hours of bedtime makes it particularly likely.
Caffeine and spicy foods work through similar mechanisms, stimulating your nervous system and raising your core temperature. Cutting these out after mid-afternoon is a reasonable first experiment. If your night sweats improve within a week or two of eliminating evening alcohol and caffeine, you’ve found your answer.
Medications That Cause Night Sweats
Several drug classes are known to trigger sweating at night. Antidepressants, particularly SSRIs, are among the most frequently reported culprits. Antihypertensives (blood pressure medications), over-the-counter pain relievers like acetaminophen and aspirin, and niacin supplements can all contribute. The mechanism with pain relievers is often a rebound effect: as the drug’s fever-reducing action wears off overnight, your body overcompensates with a temperature spike and sweating.
Some less common medications carry night sweats as a labeled side effect. Certain HIV antivirals report it in up to 2 percent of users. Interferon-based treatments list it at around 8 percent. If your night sweats started around the same time as a new prescription, that timing is worth noting. Don’t stop any medication on your own, but a conversation with your prescriber about alternatives or dose adjustments is a straightforward next step.
Low Testosterone and Hormonal Shifts
Testosterone levels in men decline gradually with age, and when they drop below a certain threshold, the body’s temperature regulation can become less stable. This is the same basic mechanism behind menopausal hot flashes in women. The hypothalamus, which acts as your internal thermostat, becomes more sensitive to small temperature changes, triggering a cooling response (sweating) that’s disproportionate to actual body heat.
Men undergoing treatment for prostate cancer experience this most dramatically. Almost 80 percent of patients on androgen deprivation therapy (which suppresses testosterone) develop hot flashes and night sweats. Research from a multicenter clinical trial found that a four-week cognitive behavioral therapy program reduced the impact of hot flashes, night sweats, and the anxiety and depression that come with them, with benefits lasting at least six weeks. Lifestyle changes like avoiding caffeine, alcohol, and tobacco while increasing physical activity also helped in this population.
For men not on cancer treatment but experiencing low testosterone, blood work can confirm the diagnosis. Testosterone replacement therapy often resolves night sweats when low levels are the cause.
Sleep Apnea as a Hidden Cause
Obstructive sleep apnea is an underdiagnosed trigger for night sweats. When your airway collapses repeatedly during sleep, your body mounts a stress response each time: adrenaline surges, your heart rate spikes, and you sweat. Many men with sleep apnea don’t realize they have it because they attribute their poor sleep to other factors. The connection is strong enough that Mayo Clinic researchers found self-reported severe night sweats were linked to intermediate or high risk of sleep apnea, yet 65 percent of those at elevated risk remained undiagnosed two years later.
If you snore heavily, wake up gasping, or feel exhausted despite a full night’s sleep, sleep apnea is worth investigating. A sleep study can confirm the diagnosis, and treatment with a CPAP machine or oral appliance often eliminates the night sweats along with the apnea itself.
When Night Sweats Signal Something Serious
Most night sweats in men trace back to the causes above. But certain patterns suggest something more concerning. The combination of drenching night sweats, unexplained weight loss, persistent fevers, and swollen lymph nodes is a recognized cluster associated with lymphomas and other cancers, as well as chronic infections like tuberculosis. This grouping is sometimes called “B symptoms” in oncology, and it warrants prompt evaluation.
The Mayo Clinic lists infections like endocarditis (an infection of the heart lining), HIV, tuberculosis, and bone infections as potential causes. Hyperthyroidism, where your thyroid gland produces too much hormone, speeds up your entire metabolism and can cause sweating both day and night. Autoimmune disorders and certain rare tumors of the adrenal glands (pheochromocytoma) or neuroendocrine system also appear on the list. These are uncommon, but if your night sweats are new, severe, persistent, and accompanied by other symptoms, getting blood work and a physical exam can rule them out efficiently.
Practical Steps That Help Right Now
While you work on identifying the root cause, several strategies can reduce the severity of night sweats tonight:
- Lower the room temperature to between 60 and 67 degrees Fahrenheit, or as cool as you can tolerate comfortably.
- Switch your bedding. A lighter duvet or just a top sheet during warmer months can make a significant difference. Keep a spare set nearby so you can change sheets without fully waking up.
- Skip alcohol for three to four hours before bed. Even moderate drinking can trigger vasodilation and sweating overnight.
- Stay hydrated. Dehydration makes your body worse at regulating temperature. Drink water throughout the day, tapering off an hour or two before bed to avoid bathroom trips.
- Exercise earlier in the day. Physical activity raises your core temperature for several hours. Morning or afternoon workouts give your body time to cool down before sleep.
Medical Treatment for Persistent Cases
When lifestyle changes aren’t enough and an underlying condition has been identified, treatment targets the cause directly. For hyperthyroidism, normalizing thyroid hormone levels stops the sweating. For sleep apnea, treating the airway obstruction resolves it. For low testosterone, hormone replacement addresses both the sweats and the fatigue, mood changes, and reduced muscle mass that often accompany it.
For cases where the sweating itself is severe and not fully explained by another condition, prescription options exist. Aluminum chloride antiperspirants, applied to dry skin before bed and washed off in the morning, can reduce sweating after a few nights of consistent use. Nerve-blocking medications that prevent sweat glands from activating are another option, though they come with side effects like dry mouth, blurred vision, and bladder issues. Some antidepressants also reduce sweating as a secondary effect, which can be useful when anxiety or stress is part of the picture.
For men on prostate cancer treatment, oxybutynin (a medication typically used for bladder control) showed meaningful reductions in hot flash frequency and severity in clinical trials compared to placebo, though it’s not FDA-approved for this specific use. Notably, some treatments that work well for hot flashes in women, like certain antidepressants, have been shown to be ineffective in men with prostate cancer, so what works is genuinely different between the sexes.