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Low Sex Drive in Men: Causes and Evaluation

Clinical review pending

How hormones, medications, mood, and relationships influence libido, and what can help explain a persistent change in sexual desire.

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What does low libido mean?

Libido means sexual desire: an interest in sex, sexual thoughts, and fantasies. A decline in desire is different from erectile dysfunction, which affects the physical ability to have an erection. The two can occur together and influence each other.

People vary in how often they feel sexual desire. Low desire is not a disease in itself. Clinically, what matters is a persistent or recurring change, the distress it causes, and other possible explanations. Different levels of desire within a relationship do not automatically mean either person has a disorder.

In a British survey, 15% of sexually active men ages 16–74 reported having no interest in sex for at least 3 months during the previous year. That figure describes respondents’ experiences, not how many had a disorder requiring treatment. It does show that these changes are far from unusual. Study

Common reasons for lower sexual desire

Several influences often overlap:

  • Hormones: Testosterone deficiency can reduce desire. Age alone, however, is not a sufficient explanation for a change.
  • Chronic conditions: Heart, kidney, and metabolic diseases may contribute through physical strain, medication effects, or hormonal changes.
  • Medications: Some antidepressants, certain blood pressure medicines, and prostate cancer treatments can affect sexual function and desire.
  • Mental health and emotional strain: Depression, anxiety, ongoing stress, and exhaustion can reduce interest in sex.
  • Relationships and life circumstances: Conflict, a lack of closeness, or difficult life changes may play a part.
  • Daily habits and substances: Alcohol, smoking, recreational drugs, inactivity, or excessive physical strain can contribute.

This list cannot identify the cause for an individual. One useful starting point is to consider what changed just before the symptoms began.

What a medical evaluation involves

The conversation usually begins with the pattern: When did the change start, does it happen in every situation, and how much does it bother you? Erections, sleep, mood, relationships, and plans to have children may also matter. The discussion can focus on the questions that are most important to you.

Depending on the situation, the next steps may include a physical examination and a review of all medications, over-the-counter products, and hormones. If testosterone deficiency is a possibility, total testosterone is usually measured in the morning after fasting. A low result needs to be confirmed on another morning and considered alongside relevant symptoms. An acute illness or unsuitable testing conditions can affect the result. Guideline

Not everyone needs an extensive hormone panel at the outset. Further tests depend on clues from the conversation, examination, and initial findings.

Blood tests that may help

Test What it measures Possible relevance to low libido
Total testosterone Free and protein-bound testosterone in the blood Confirmed deficiency can be associated with reduced desire.
SHBG A protein that binds sex hormones Altered levels can make total testosterone harder to interpret.
Free testosterone The unbound portion May add useful information when total testosterone is borderline or SHBG is altered; a reliable method is essential.
Estradiol An estrogen produced in men partly from testosterone Estrogen deficiency can also affect sexual function; testing is not necessary in every situation.
Prolactin A pituitary hormone Elevated levels can affect desire and hormonal regulation; testing depends on clinical suspicion.
LH and FSH Signals from the pituitary to the testes In confirmed deficiency, these help distinguish a testicular problem from a problem higher in the hormonal system.
TSH A hormone that regulates the thyroid May be useful when a thyroid disorder is suspected.
HbA1c Longer-term blood glucose levels Helps assess possible diabetes or how well it is controlled.

No single value fully explains sexual desire. Normal hormone results do not make the symptoms any less real.

Why libido can be low despite normal testosterone

When SHBG is high, total testosterone may be within range while free testosterone is low. In a study of 3,334 European men ages 40–79, this pattern was associated with more sexual symptoms. That association can support a focused evaluation, but it does not establish a hormonal cause in every individual. Study

People differ in how they respond to sex hormones. This does not establish a personal target level to pursue with hormone treatment without further assessment. Even when hormone levels are normal, depression, medications, pain, sleep problems, or relationship conflict can reduce desire.

Treatment depends on the cause

Confirmed cause or important influence Possible approach
Testosterone deficiency with relevant symptoms and confirmed low levels Identify the cause and, where appropriate, consider clinician-supervised treatment after weighing benefits and risks
Elevated prolactin Investigate and treat the underlying cause
Thyroid dysfunction Treat the thyroid problem and reassess symptoms over time
Medication side effects Discuss the dose or alternatives with the prescribing clinician
Depression, anxiety, or ongoing stress Appropriate psychotherapy or other medical support
Relationship difficulties Couples therapy or sex therapy, if helpful
Habits that are affecting well-being Reduce alcohol, support smoking cessation, and adapt physical activity to the person’s capacity

In a one-year study of 470 men age 65 and older, testosterone treatment improved sexual desire and activity compared with placebo. Participants already had low libido and confirmed low testosterone. The result does not automatically apply to younger men or people with normal levels. Study

Taking testosterone can substantially reduce or suppress sperm production. Plans to have children now or in the near future need to be discussed before treatment. Prescribed medications should not be stopped without medical guidance, even when side effects are suspected.

When to seek medical support

A medical appointment can help if the change persists, bothers you, or affects your relationship. Other clues include fewer morning erections, new erection problems, a noticeable change in testicular size, or symptoms that began soon after starting a medication.

Headaches and vision changes alongside hormonal symptoms may call for a pituitary evaluation. A sudden severe headache or an acute change in vision needs urgent assessment. Persistent low mood or a loss of interest across many areas of life should also be discussed.

For the appointment, it helps to bring a brief timeline, a complete medication list, and any previous test results. The aim is to identify causes that are affecting you and find suitable support. Your symptoms and needs should guide what you hope to improve.

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