Low Testosterone in Singapore: Symptoms, Causes, Testing, and Treatment

Low testosterone is one of the more common — and more under-discussed — health concerns men in Singapore face as they move through their 30s, 40s, and beyond. A health-screening study of 1,000 men conducted in Singapore between 2007 and 2009 found that around 26% had clinically low testosterone levels, and international data suggests the figure rises sharply with age. Despite this, only a minority of affected men ever seek help. The reasons range from the symptoms being non-specific (fatigue, low mood, lower libido) to the topic feeling private or embarrassing to raise with a doctor.

This guide explains, in plain English, what low testosterone actually is, what it does in the body, how doctors in Singapore diagnose it, and what treatment options exist — including testosterone replacement therapy (TRT). It is not a substitute for a consultation with a doctor, but it should help you understand what you might be experiencing and what to do next.

If you would rather speak to a doctor directly, you can book a confidential consultation with a Singapore-licensed doctor on Noah.

What is testosterone, and what does it do?

Testosterone is the principal male sex hormone, produced predominantly in the testes under signals from the pituitary gland and the hypothalamus. Although it is most associated with masculine sexual development and function, testosterone is involved in a much wider range of physiological processes than most people realise. It contributes to muscle mass and strength, bone density, red blood cell production, libido, erectile function, fat distribution, mood regulation, cognitive focus, and energy levels.

Testosterone production typically peaks in late adolescence and the early twenties and then begins a slow, gradual decline. On average, a man's total testosterone falls by roughly 1% per year from about age 40 onwards. For most men this decline is unremarkable. For others, the drop is steep enough — or interacts with other factors enough — to cause symptoms that interfere with daily life. When this happens, we use the term low testosterone, testosterone deficiency syndrome, or, more clinically, hypogonadism.

How common is low testosterone in Singapore?

The most-cited Singapore-specific data point comes from a health-screening study referenced by SingHealth, which examined 1,000 men in Singapore between 2007 and 2009 and found that around 26% had clinically low testosterone levels. That figure aligns closely with international literature, which suggests that 20–40% of men over the age of 45 have testosterone levels considered clinically low, depending on the threshold applied and the population studied.

What is more striking than the prevalence is the treatment gap. Estimates of how many men with low testosterone actually seek and receive treatment range from 5–35%, depending on the source and the population. The remainder live with symptoms — often for years — without ever connecting them to a hormonal cause.

The takeaway: low testosterone is not unusual. If you are experiencing several of the symptoms described below, you are not alone, and the explanation may be more straightforward than you assume.

Image placeholder — body 1: Simple infographic showing testosterone decline over age, or a Singapore prevalence stat visualisation (26% of men in SG screening study). Alt text: An infographic showing the prevalence of low testosterone among men in Singapore.

Signs and symptoms of low testosterone

The symptoms of low testosterone tend to cluster across four domains. Many of them can have causes other than low testosterone — which is part of why this condition is under-diagnosed — but a pattern of several symptoms together is worth paying attention to.

Physical symptoms

• Persistent fatigue, particularly the kind of low energy that does not improve with rest
• Reduced muscle mass and strength, especially if you used to recover well from workouts and now do not
• Increased body fat, particularly around the abdomen
• Decreased bone density, which is asymptomatic in the short term but increases fracture risk over time
• Hair changes, including reduced body hair

Sexual symptoms

• Reduced libido — one of the earliest and most common signs
• Erectile difficulties — trouble achieving or maintaining an erection
• Fewer spontaneous (morning) erections
• Reduced ejaculate volume and changes in orgasm intensity

Cognitive and emotional symptoms

• Low mood, irritability, or a sense of flatness
• Reduced motivation and drive
• Difficulty concentrating, sometimes described as brain fog
• Increased anxiety

Sleep and metabolic symptoms

• Disrupted sleep or worsening sleep quality
• Hot flashes or sweating, reported less commonly
• Insulin sensitivity changes and, over time, increased risk of metabolic conditions

If you recognise yourself in three or more of these categories, low testosterone is one of several possible explanations worth investigating with a doctor. For a more detailed breakdown, see our guide to the 13 signs of low testosterone.

What causes low testosterone?

Doctors classify the causes of low testosterone into two broad categories, based on where the problem originates.

Primary hypogonadism arises in the testes themselves. The pituitary signals are normal, but the testes cannot produce enough testosterone in response. Causes include genetic conditions (such as Klinefelter syndrome), undescended testes, infection (mumps orchitis in childhood, for example), injury, certain cancer treatments (chemotherapy or radiation), and some autoimmune conditions.

Secondary hypogonadism arises further upstream, in the hypothalamus or the pituitary gland. The testes themselves are healthy, but they aren't receiving the signal to produce testosterone. Causes include pituitary disorders or tumours, certain medications (especially opioids and long-term corticosteroids), severe obesity, chronic illness, and significant stress on the body.

Many men diagnosed with low testosterone today fall under a third, related label: late-onset hypogonadism, often called andropause. This describes the gradual, age-related decline in testosterone that becomes clinically significant in some men in their 40s, 50s, and 60s. We cover the relationship between andropause and low testosterone in a dedicated article.

Lifestyle and reversible factors

A number of common, modifiable factors can contribute to low testosterone — and in some cases, addressing them is enough to bring levels back into the normal range.

• Chronic sleep deprivation — even a week of restricted sleep can measurably lower testosterone in healthy young men
• Excess body weight, particularly abdominal fat, which converts testosterone to oestrogen via the enzyme aromatase
• Heavy alcohol use
• Persistent psychological stress, which elevates cortisol and suppresses the HPG (hypothalamic-pituitary-gonadal) axis
• Sedentary lifestyle, particularly the absence of resistance training
• Some prescription medications, including opioids, certain antidepressants, and corticosteroids

If you have any of these factors in play, your doctor will usually want to address them — either before, or alongside, any consideration of medical treatment.

How is low testosterone diagnosed in Singapore?

Diagnosis combines two pieces of information: how you are feeling (symptoms), and what your blood test results show (biochemistry). Neither is sufficient on its own. A man with symptoms but normal blood levels usually has another underlying cause that needs investigating; a man with low blood levels but no symptoms may not need treatment at all.

The blood test

Testosterone is measured through a blood sample, typically drawn in the morning when levels are highest — usually between 7am and 10am. Because testosterone has a strong circadian rhythm, results drawn later in the day can underestimate true levels and produce misleading results.

Three main values are reported on a comprehensive testosterone panel:

• Total testosterone — the total amount of testosterone in your blood, both bound and unbound
• Free testosterone — the small fraction (typically 1–2%) that is unbound and biologically active
• Sex hormone-binding globulin (SHBG) — the protein that binds most testosterone and affects how much is biologically available

Most clinicians in Singapore start with total testosterone; if it is borderline or symptoms are pronounced, free testosterone and SHBG are usually added for a fuller picture.

Where you can get tested

Singaporean men have several options for testosterone testing:

• Polyclinics and government hospitals — typically the most affordable route. A consultation is usually required, and pricing varies by subsidy status
• Private GPs and men's health clinics — broader appointment availability, often same-day or next-day
• Telemedicine services — including Noah — where the consultation is online and you visit a partner lab for the blood draw

A consultation typically costs between S$40 and S$100 depending on subsidy and clinic type, and the testosterone test itself ranges from roughly S$50 to S$200 depending on the panel and setting. Testosterone testing is not covered by Medisave or CHAS, although some private health insurance plans may include it.

For a more detailed walkthrough of what to expect, costs, and how to prepare, see our guide to testosterone testing in Singapore.

Reading your results

Reference ranges vary slightly between labs, but for most adult men, a total testosterone level of above approximately 12 nmol/L (roughly 350 ng/dL) is generally considered within the normal range. Levels below 8 nmol/L (around 230 ng/dL) are generally considered low; the range between is often described as borderline and interpreted alongside symptoms.

A single low result is not enough for a diagnosis. Clinical guidelines recommend repeating the test on a separate morning to confirm, because day-to-day variation, recent illness, sleep loss, or strenuous exercise can transiently lower testosterone. Our guide to reading your testosterone results covers how to interpret total, free, and SHBG.

Image placeholder — body 2: Treatment options visual — a clean photo of testosterone gel and injection vial as treatment categories (not branded products), or an illustration of the clinical pathway. Alt text: An illustration of testosterone replacement therapy treatment categories.

Treatment options

If low testosterone is confirmed, treatment generally proceeds along three lines, often in combination.

Address underlying and reversible causes first

If your low testosterone is being driven or worsened by sleep deprivation, significant excess weight, heavy alcohol use, an unmanaged thyroid condition, or a medication side effect, your doctor will usually want to address these first — or alongside any other treatment. In a meaningful minority of cases, lifestyle and medical optimisation alone is enough to restore healthy testosterone levels.

Lifestyle changes that support healthy testosterone

The evidence base around lifestyle and testosterone is now reasonably mature, and a handful of interventions reliably move the needle:

• Sleep: aim for 7–9 hours per night, with consistent timing
• Strength training, particularly compound lifts (squats, deadlifts, presses), 2–4 times per week
• Weight management, especially reducing abdominal fat
• Moderating alcohol intake
• Stress management through whatever approach works for you sustainably

These are not quick fixes — measurable changes in testosterone typically take weeks to months — but they have other benefits and are the foundation of any sustained improvement.

Testosterone Replacement Therapy (TRT)

For men whose testosterone remains low after addressing reversible factors — and who have symptoms significant enough to affect quality of life — testosterone replacement therapy is one option a doctor may discuss.

TRT is a prescription-only treatment. In Singapore, it is regulated by the Health Sciences Authority (HSA) and can only be prescribed and supplied through a registered doctor and a licensed pharmacy. It is not available over the counter, online from unregulated sources, or as a supplement.

The two forms of TRT currently used in Singapore are:

• Injectable testosterone, typically administered every few weeks. Long-acting formulations are commonly used because they provide more stable hormone levels than older short-acting injections
• Topical testosterone gel, applied daily to the skin, which produces relatively steady absorption when used consistently

Other forms of TRT used in some markets — including oral testosterone, skin patches, and implanted pellets — are not currently available in Singapore.

Side effects and considerations

Like any prescription treatment, TRT has potential side effects and is not appropriate for every man. Possible considerations include:

• Effects on fertility — TRT can reduce sperm production, so men who wish to have children in the future should discuss alternatives or adjuncts with their doctor
• Cardiovascular considerations — guidelines have evolved in recent years; current Endocrine Society guidance, supported by the 2023 TRAVERSE trial, suggests that TRT, when appropriately indicated and monitored, does not appear to substantially increase cardiovascular risk for most men, but this remains an area of active research
• Prostate monitoring — men starting TRT are typically screened for prostate health and monitored over time
• Increased red blood cell count (polycythaemia) — usually manageable with monitoring and dose adjustment
• Skin reactions with gel formulations, and the need to avoid skin-to-skin transfer to women or children

All of these are reasons why TRT is started after a careful clinical assessment, monitored at follow-up (typically a re-check at 6 weeks and again at 3–6 months), and adjusted as needed.

When should I speak to a doctor?

There is no single threshold, but the following situations are generally worth a consultation:

• You recognise three or more of the symptoms listed above, particularly if they have developed over months or years
• Your sex drive, erections, or mood have changed in a way that you find distressing
• You are persistently tired despite adequate sleep, and other causes have been ruled out
• A previous test has shown borderline or low testosterone, and you would like to discuss next steps
• You are simply curious about your levels and want a baseline

A consultation is not a commitment to treatment. It is a conversation about what you're experiencing, what tests might be helpful, and what your options look like if anything is found. With Noah, the consultation is conducted online by a Singapore-licensed doctor, and any blood work is arranged through a partner lab — there's no clinic waiting room involved.

How low testosterone connects to other conditions

Erectile dysfunction (ED)

Low testosterone is one of several possible contributors to erectile difficulties — but it is not the most common cause. Vascular factors (such as hypertension, diabetes, and atherosclerosis), neurological factors, medication side effects, and psychological factors are typically considered first. That said, in men with both ED and other symptoms of low testosterone, addressing the testosterone deficiency often improves both. Read more about erectile dysfunction and treatment options in Singapore.

Andropause

Andropause and low testosterone are closely related but not identical. Andropause refers specifically to the age-related decline in testosterone in older men; low testosterone (or hypogonadism) is the broader clinical condition that can affect men at any age. Our article on andropause vs low testosterone explains the distinction.

Frequently asked questions

What is considered a low testosterone level?

For most adult men, a total testosterone level below approximately 8 nmol/L (around 230 ng/dL) is generally considered low. The range between roughly 8 and 12 nmol/L is often described as borderline and interpreted alongside symptoms. Reference ranges vary slightly between labs, and a single result is not enough for a diagnosis — guidelines recommend a confirmatory repeat test on a separate morning.

At what age does testosterone start to drop?

On average, testosterone begins a gradual decline of approximately 1% per year from about age 40 onwards. Most men do not notice significant effects until their late 40s or 50s, and some not at all. Earlier or steeper declines can indicate an underlying cause worth investigating.

Is testosterone replacement therapy safe?

TRT, when appropriately indicated, dosed, and monitored by a doctor, is considered a well-established treatment for men with confirmed low testosterone and significant symptoms. It is not without risks — see the side effects section above — and it is not appropriate for everyone, particularly men who wish to preserve fertility in the near term. Current Endocrine Society guidance, supported by the 2023 TRAVERSE trial, does not flag a substantial cardiovascular risk for most appropriately-selected patients, although this remains an active area of research.

Can low testosterone be reversed without medication?

Sometimes, yes — particularly when the underlying cause is reversible. Addressing significant sleep deprivation, losing meaningful amounts of abdominal weight, reducing heavy alcohol use, and starting resistance training have all been shown to improve testosterone levels. The improvement is usually gradual and partial; it may or may not be sufficient on its own, depending on the starting point and the cause.

Is the testosterone test in Singapore covered by Medisave or insurance?

Testosterone testing is not covered by Medisave or CHAS in Singapore. Some private health insurance plans may cover it, depending on the policy. Costs typically range from around S$50 to S$200 for the test itself, plus a consultation fee of approximately S$40–S$100 depending on subsidy status and clinic type.

How quickly does TRT start to work?

Symptoms tend to improve in stages. Energy, mood, and libido are often the first to respond, sometimes within 3–6 weeks of starting treatment. Changes in muscle mass and body composition are slower, typically taking 3–6 months of consistent treatment to become noticeable. Your doctor will usually re-check your blood levels at around 6 weeks to fine-tune the dose, with follow-ups thereafter.

Speak to a Singapore-licensed doctor about your levels

If you've read this far and you suspect low testosterone may be part of what you've been experiencing, the next step is a conversation with a doctor. The most useful thing you can bring is your own symptom history — what's changed, when it started, and what feels different.

Book a confidential consultation with a Singapore-licensed doctor on Noah

All consultations on Noah are conducted by Singapore-licensed doctors registered with the Singapore Medical Council. Any prescription treatment, where appropriate, is dispensed by HSA-compliant pharmacy partners.