About 1 in 4 Singaporean men have testosterone levels below the healthy range, according to a health screening study conducted between 2007 and 2009. Yet most of them don't realize it. The symptoms,persistent fatigue, reduced libido, low mood, and loss of muscle mass,get blamed on aging, work stress, or simply "getting older." But this condition, called andropause or late-onset hypogonadism, is often treatable, and the first step is understanding what's actually happening in your body.

What Is Andropause, and Why Should You Care?

Andropause describes what happens when testosterone falls below the healthy range in middle-aged men and produces real symptoms. Unlike the abrupt hormonal shift women experience during menopause, testosterone decline in men is gradual. Testosterone production peaks in the late teens and early 20s, then falls at roughly 1% per year starting around age 30. By age 60, average levels are noticeably lower than they were at 30, but not every man drops into the symptomatic range.

The key insight: not all low testosterone causes symptoms. Some men have low levels and feel fine. Others have symptoms that match the condition perfectly. That's why a blood test matters. Feeling flat or tired is not enough on its own to confirm andropause; you need both consistent symptoms and confirmed low testosterone on a morning blood test to make the diagnosis.

What Are the Signs You Might Have Andropause?

Andropause symptoms are non-specific, which means they overlap with depression, sleep disorders, thyroid problems, and the general drag of an unhealthy lifestyle. That's why three or more of the following symptoms together, particularly if they've come on gradually over months or years, are worth a conversation with a doctor:

• Sexual symptoms: Reduced libido or sex drive, erectile difficulties or weaker erections, fewer spontaneous morning erections, and reduced volume of ejaculate
• Energy and fitness: Persistent fatigue and low energy, loss of muscle mass and strength (particularly in the legs and arms), increased body fat (especially around the waist), reduced exercise tolerance, and longer recovery times
• Mood and cognition: Low mood, irritability or a sense of flatness, reduced motivation or drive, poor concentration and memory, and disturbed sleep with waking unrefreshed
• Physical changes: Hot flushes or sweating and reduced body and facial hair

What Causes Low Testosterone in Middle-Aged Men?

Andropause is rarely caused by aging alone. In most men, several factors stack up together, and that's also why several factors can be unwound. Understanding what's driving your low testosterone shapes the entire treatment plan. For two men with identical blood results, the right next step can be very different.

The most common reversible causes include obesity (fat tissue converts testosterone into estrogen, one of the strongest reversible drivers of low testosterone), type 2 diabetes and metabolic syndrome, poor sleep and untreated sleep apnea (testosterone is largely produced during sleep), heavy alcohol intake, chronic stress, and a sedentary lifestyle with little resistance training. Irreversible causes include pituitary or hypothalamic disorders, long-term use of opioid painkillers or corticosteroids, past testicular injury or infection, and chronic illnesses such as kidney disease, liver disease, or HIV.

How to Restore Testosterone Naturally: Steps to Try First

Treatment is not a single prescription; it's a sequence, with the simplest and most reversible options tried first. For most men, the largest gains come from steps that don't involve a prescription pad. Lifestyle changes alone can lift testosterone by a meaningful amount over 3 to 6 months.

• Weight loss: Losing 5 to 10% of body weight, particularly visceral fat around the waist, is one of the most effective testosterone boosts in overweight men
• Resistance training: Two to three sessions a week of compound lifts (squats, deadlifts, presses, rows) raises testosterone more reliably than steady-state cardio alone
• Sleep optimization: Aiming for 7 to 8 hours of quality sleep and treating sleep apnea where present
• Alcohol moderation: Heavy or daily drinking suppresses testosterone, so reducing intake can help restore levels
• Medication review: Long-term opioids, certain antidepressants, and corticosteroids can lower testosterone; alternatives may be available
• Chronic disease management: Better diabetes, hypertension, and cholesterol control often improves testosterone alongside overall health

When Do You Need Testosterone Replacement Therapy?

If a specific cause is found,untreated sleep apnea, a pituitary issue, or a medication side effect,treating that root cause often restores testosterone without the need for hormone therapy. Testosterone replacement therapy (TRT) is considered when symptoms persist and testosterone remains low after lifestyle changes, or when there is an irreversible cause such as primary testicular failure. It is given as an intramuscular injection or a topical gel and is monitored with regular blood tests for haematocrit, PSA (prostate-specific antigen), and clinical response.

"TRT is not started for men with normal testosterone, for performance enhancement, or for men currently or planning to conceive, since TRT suppresses sperm production and recovery after stopping can take 6 to 12 months and isn't guaranteed," explained Dr. Joel Foo.

Dr. Joel Foo, Men's Health Doctor and Family Physician

Many men with andropause also have erectile dysfunction, weight gain, or low mood. Where these are present, treating them in parallel rather than waiting for testosterone alone to fix everything usually produces a better outcome.

How Is Andropause Diagnosed?

Diagnosis is built on two pillars: consistent symptoms and confirmed low testosterone on a morning blood test. Either alone is not enough. Testosterone follows a daily rhythm, with the highest levels between 7 a.m. and 11 a.m. A blood test at this window, ideally fasted, gives the most reliable result. A repeat test is usually arranged a few weeks later to confirm a low result before any treatment is started.

Beyond total testosterone, doctors may order additional tests to get a complete picture. Free testosterone or SHBG (sex hormone-binding globulin) is useful when total testosterone is borderline or in men with obesity, diabetes, or thyroid disease. LH (luteinizing hormone) and FSH (follicle-stimulating hormone) help distinguish between primary hypogonadism (a testicular cause) and secondary hypogonadism (a pituitary or hypothalamic cause). Prolactin screening can detect pituitary tumors. A full blood count, lipid panel, HbA1c (a measure of average blood sugar), and liver and kidney function tests help identify related metabolic conditions.

If you're experiencing a combination of fatigue, reduced libido, mood changes, or loss of muscle mass, a conversation with your doctor is the first step. A morning testosterone blood test can confirm whether andropause is the culprit, and from there, a personalized treatment plan can address the root causes and restore your energy and vitality.