Low Libido in Men: Common Causes, When to See a Doctor

Sex drive changes over time. For most men, those changes are gradual and unremarkable. But when libido drops noticeably and stays low — affecting how you feel about yourself, your relationship, or your everyday energy — it is worth looking into. This guide explains the common causes of low libido in men, when low testosterone is part of the picture, and when a conversation with a doctor is worth having.

There is no single "normal" libido

Sex drive varies enormously between men, and within the same man across different life stages. Some men are highly driven sexually for life; others are not, and never were. Both are normal. What matters clinically is not where you sit on that spectrum, but whether you've moved meaningfully along it.

The relevant clinical signal is a clear change from your own baseline, not a comparison with a hypothetical average. If your interest in sex used to be much higher than it is now, and the drop wasn't tied to a specific life event you can name, it's worth paying attention to.

Common causes of low libido in men

Low libido rarely has one cause. More often it's a stack of contributing factors. Doctors usually think across five categories.

Lifestyle factors

• Chronic sleep deprivation
• Significant weight gain
• Heavy alcohol use
• Chronic stress at work or home
• Sedentary lifestyle

These are often under-rated and over-addressable. A man whose libido has dropped during a high-stress, low-sleep year may find that the stress and sleep are the main story, not the hormones.

Psychological and emotional factors

• Depression and anxiety
• Performance anxiety, especially after a few bad experiences
• Body image concerns
• Burnout
• Unresolved trauma or shame around sex

These are particularly common in men under 45 with low libido and are often the most important factor.

Relationship factors

• Long-term partnership dynamics
• Unresolved conflict
• Mismatched libidos, leading to avoidance
• Changes in the relationship itself (parenthood, new responsibilities)

Medical factors

• Chronic illness (diabetes, cardiovascular disease, chronic pain)
• Thyroid dysfunction
• High prolactin (less common, but a specific finding)
• Sleep apnoea

Hormonal factors

Low testosterone is the hormonal cause most commonly associated with reduced libido. Low libido is one of the most consistent and earliest-appearing symptoms of low testosterone in men, and it correlates more reliably with measurable testosterone changes than most other symptoms do. For a fuller picture, see our complete guide to low testosterone in Singapore.

Medications that commonly lower libido

Several common prescription medications can reduce sex drive as a side effect. These include:

• SSRIs and some other antidepressants (often the most cited)
• Beta-blockers used for blood pressure or heart conditions
• Finasteride used for hair loss in some men, though the effect is contested and often modest
• Some antipsychotics and mood stabilisers
• Opioids with regular use
• Some chemotherapy agents

If you've started a new medication and noticed a change in libido around the same time, mention it to your doctor. Adjustments are often possible without compromising the underlying treatment.

When low libido suggests low testosterone specifically

Low libido is more likely to be hormonally driven when it appears alongside:

• Fatigue that doesn't respond to rest
• Erectile difficulties
• Fewer spontaneous (morning) erections
• Low mood or motivation
• Loss of muscle mass or strength
• Increased abdominal fat

A man with isolated low libido and no other symptoms usually has a non-hormonal cause. A man with low libido plus several of the above probably warrants a testosterone test — see our guide to getting a testosterone test in Singapore.

When to see a doctor

Speak to a doctor about low libido when:

• It has lasted more than a few months without an obvious cause
• It is significantly affecting your wellbeing or your relationship
• It is accompanied by other symptoms (fatigue, erectile difficulties, mood changes)
• You are taking medications that may be contributing
• You'd like to understand what is causing it, even if you're not committed to treatment

A consultation is a conversation, not a commitment. The Singapore-licensed doctors on Noah are familiar with these conversations and can take them at your pace.

What treatment looks like (and what it doesn't)

There is no single "libido pill." Treatment depends on the cause.

If the picture is lifestyle-led — sleep, weight, stress — the most effective interventions are the ones that address those factors directly. They are also the ones that compound the longest.

If a medication is contributing, your doctor may be able to adjust dose or substitute. Do not stop prescribed medication without speaking to a doctor first.

If the picture is psychological or relational, the most effective interventions are therapy-based — individual or couples — not pharmaceutical.

If low testosterone is confirmed and significant, testosterone replacement therapy can meaningfully improve libido in many men — but it is a prescription treatment with specific indications, monitoring, and side effects, and it is not a first-line response to libido alone.

Frequently asked questions

Is low libido just a normal part of getting older?

Some reduction in libido with age is common, but a sharp or distressing drop is not just "normal ageing" — it usually has an identifiable cause.

Can stress alone cause low libido?

Yes. Chronic stress raises cortisol and suppresses testosterone, reduces sleep quality, and dominates mental bandwidth in ways that crowd out sexual interest. For many men in demanding careers, stress is the main story.

Should I get my testosterone tested if my libido has dropped?

Speak to a doctor about it. If your libido drop is isolated (no fatigue, no mood change, no erectile issues), other causes are usually addressed first. If it sits in a cluster of other symptoms, testing is more likely to be useful.

Will testosterone replacement therapy bring my libido back?

If your libido drop is being driven by clinically low testosterone, treatment often helps meaningfully — frequently within the first 3–6 weeks. If low testosterone isn't the underlying cause, TRT will not help and is not appropriate.

Speak to a doctor on Noah

If a noticeable, persistent drop in libido is part of what you've been navigating, you can book a confidential consultation with a Singapore-licensed doctor on Noah.