Andropause is a gradual decline in testosterone that some men experience starting in their mid-30s to 40s, producing symptoms like fatigue, low sex drive, and mood changes. Unlike menopause in women, which involves a relatively sharp drop in hormones over a few years, andropause unfolds slowly over decades. Total testosterone decreases at roughly 0.4% per year in men aged 40 to 70, while free testosterone (the form your body can readily use) drops faster, at about 1.3% per year.
The term itself comes from the Greek “andras” (male) and “pause” (cessation), but it’s somewhat misleading. There’s no hard stop to male hormone production the way ovulation ceases in women. For that reason, most clinicians prefer the term “late-onset hypogonadism,” which simply means the body is producing less testosterone than it needs to function well.
How It Differs From Menopause
The comparison with menopause is understandable but only loosely accurate. Women experience a dramatic hormonal shift, typically over two to five years, that ends their fertility entirely. In men, the decline is so gradual that many never notice it. Fertility can persist well into old age, even as testosterone levels fall. And while virtually all women go through menopause, not all men with low testosterone develop symptoms. The threshold at which problems appear varies significantly from person to person, which is part of why andropause has been harder for medicine to define as a clear-cut condition.
Common Symptoms
The most prominent symptoms are sexual: reduced desire, fewer morning erections, and difficulty achieving or maintaining erections. Free testosterone levels correlate directly with libido, erectile function, and the ability to reach orgasm, so these are often the first changes men notice.
Beyond sexual health, falling testosterone affects the body in several other ways:
- Body composition: Loss of muscle mass and strength, with an increase in body fat, particularly around the midsection.
- Bone health: Reduced bone mineral density. Osteoporosis is roughly twice as common in men with low testosterone compared to men with normal levels (6% vs. 2.8%).
- Mood and cognition: Irritability, depression, reduced motivation, and difficulty concentrating. Some men also experience declines in verbal and visual memory.
- Energy and sleep: Persistent fatigue, lower vitality, and increased sleepiness or trouble sleeping.
- Other changes: Hot flashes, sweating, breast tenderness or swelling, and mild unexplained anemia.
A landmark 1946 paper described the pattern as “nervousness, reduced potency, decreased libido, irritability, fatigue, depression, memory problems, sleep disturbances, and hot flushes.” Nearly 80 years later, that list still holds up remarkably well.
How Low Testosterone Is Diagnosed
Diagnosis requires two things: symptoms consistent with testosterone deficiency and a blood test confirming low levels. A simple screening tool called the ADAM questionnaire (Androgen Deficiency in Aging Males) asks about ten symptoms, including changes in libido, energy, strength, and mood. It catches about 88% of men who turn out to have low testosterone, though it also flags some men whose levels are actually normal (its specificity is around 60%). It’s a useful starting point, not a definitive test.
The blood test measures total testosterone, ideally drawn in the morning when levels peak. Major medical organizations set slightly different cutoffs for what counts as low: the American Urology Association uses 300 ng/dL, the European Association of Urology uses 350 ng/dL, and the American Association of Clinical Endocrinology uses 320 ng/dL. If your result falls below these thresholds and you have symptoms, you’re likely dealing with late-onset hypogonadism.
One important nuance: about 25% of men over 40 have low bioavailable testosterone, but many of them feel fine. Low numbers on a lab report alone don’t mean you need treatment. Symptoms matter.
Testosterone Replacement Therapy
Testosterone replacement comes in several forms: injections, skin patches, topical gels, and implanted pellets. The clearest benefit is sexual. Clinical trials show moderate improvements in sex drive, sexual thoughts, erection quality, and overall sexual satisfaction, with the most consistent effect being on libido rather than erectile function specifically.
Testosterone therapy can also improve body composition by increasing muscle mass and reducing fat, strengthen bones, and lift mood in men who are genuinely deficient. That said, guidelines from the American College of Physicians note that evidence for improvements in energy and vitality is limited.
The therapy carries real risks. It can worsen sleep apnea, stimulate excess red blood cell production (raising the risk of blood clots, including potentially dangerous clots in the lungs), cause acne, enlarge breast tissue, and shrink the testicles while reducing sperm production. It may also promote noncancerous growth of the prostate and accelerate existing prostate cancer. Some research links testosterone therapy to increased heart disease risk, though this remains an area of active debate. These tradeoffs are why treatment decisions should be individualized rather than reflexive.
Lifestyle Changes That Raise Testosterone
Before considering replacement therapy, or alongside it, several lifestyle factors meaningfully influence testosterone levels. Weight is one of the most powerful levers. For every one-point drop in BMI, testosterone increases by approximately one point (in ng/dL). Managing obesity may even prevent the age-related decline in total testosterone altogether.
Sleep is another critical factor. The body produces most of its testosterone during deep, REM-stage sleep. A disrupted sleep cycle with less time in REM is directly associated with lower testosterone levels. Prioritizing consistent sleep of seven or more hours, treating sleep apnea if present, and keeping a regular schedule can all help.
Resistance training builds muscle and independently stimulates testosterone production. Combined with weight management and better sleep, these changes can produce a measurable difference, particularly for men whose levels sit in the borderline range rather than being severely low.
Why Many Men Go Undiagnosed
Because the decline is so gradual, many men attribute their symptoms to normal aging, stress, or poor sleep and never bring them up with a doctor. The overlap with depression is another complication: fatigue, low motivation, irritability, and difficulty concentrating describe both conditions. Some men are treated for depression when low testosterone is the underlying issue, or vice versa.
The individual variability in symptom thresholds adds another layer. Two men with the same testosterone level can feel very different, one functioning well and the other struggling significantly. This makes andropause less straightforward than a condition with a single, clean diagnostic line. If you’re experiencing a combination of the symptoms described above, particularly the sexual ones alongside fatigue and mood changes, a morning blood draw is a simple and informative next step.