Low Libido in Men: Why Desire Fades and What You Can Do

Desire versus function: why the distinction matters

Libido (sex drive) and erectile function are related but separate. A man can have normal erections and low desire, or normal desire and difficulty with erections. Low libido means the interest, motivation, and mental spark for sex is reduced — not necessarily that performance is affected.

This distinction matters because the causes and treatments differ. If both are present, a clinician will try to understand which came first and whether they share an underlying cause 1Ref 1Mulhall JP, Trost LW, Brannigan RE, et al. (2018).Evaluation and Management of Testosterone Deficiency: AUA Guideline.Low testosterone as a common hormonal cause of reduced libido; diagnostic workup including testosterone, LH, FSH, prolactin; treatment considerations; obesity and prolactinoma as causes.

What physical causes should be ruled out first?

Testosterone is the primary hormonal driver of sexual desire in men. Low testosterone (hypogonadism) is one of the most common physical causes of low libido and is among the most treatable 1Ref 1Mulhall JP, Trost LW, Brannigan RE, et al. (2018).Evaluation and Management of Testosterone Deficiency: AUA Guideline.Low testosterone as a common hormonal cause of reduced libido; diagnostic workup including testosterone, LH, FSH, prolactin; treatment considerations; obesity and prolactinoma as causes.

Other physical causes worth evaluating include:

• Thyroid disorders. Both hypothyroidism and hyperthyroidism can significantly reduce sex drive and energy 2Ref 2Jonklaas J, Bianco AC, Bauer AJ, et al. (2014).Guidelines for the Treatment of Hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement.Thyroid disorders as a cause of fatigue and reduced libido; TSH testing as part of low libido workup.
• Elevated prolactin. A benign pituitary tumor (prolactinoma) or certain medications can raise prolactin, suppressing testosterone and libido. Headaches, visual changes, or milky nipple discharge are associated clues 1Ref 1Mulhall JP, Trost LW, Brannigan RE, et al. (2018).Evaluation and Management of Testosterone Deficiency: AUA Guideline.Low testosterone as a common hormonal cause of reduced libido; diagnostic workup including testosterone, LH, FSH, prolactin; treatment considerations; obesity and prolactinoma as causes.
• Chronic illness. Diabetes, heart disease, kidney disease, liver disease, and obstructive sleep apnea all suppress libido through hormonal, vascular, and fatigue-related pathways 3Ref 3American Diabetes Association Professional Practice Committee (2024).Standards of Care in Diabetes—2024.Diabetes and associated vascular/hormonal dysfunction as contributors to low libido in men.
• Obesity. Excess body fat reduces testosterone and raises estrogen, both of which reduce desire. It also worsens sleep quality and can contribute to depression 1Ref 1Mulhall JP, Trost LW, Brannigan RE, et al. (2018).Evaluation and Management of Testosterone Deficiency: AUA Guideline.Low testosterone as a common hormonal cause of reduced libido; diagnostic workup including testosterone, LH, FSH, prolactin; treatment considerations; obesity and prolactinoma as causes.

Which medications commonly lower sex drive?

This is one of the most underappreciated causes of low libido in men. Antidepressants — particularly SSRIs and SNRIs — are among the most common culprits. Reduced libido is frequently reported but often not warned about adequately 4Ref 4Warner CH, Bobo W, Warner C, Reid S, Rachal J (2006).Antidepressant Discontinuation Syndrome.SSRI/SNRI antidepressants as a common and underappreciated cause of reduced libido; importance of clinician-supervised medication management rather than abrupt discontinuation.

Other medication classes that can substantially reduce sexual desire include beta-blockers, anti-androgens, opioids, and prolactin-elevating medications (some antipsychotics and certain stomach medications). If your libido dropped around the time you started or changed a medication, that connection is worth raising with your clinician — but do not stop a prescribed medication without discussing it first 4Ref 4Warner CH, Bobo W, Warner C, Reid S, Rachal J (2006).Antidepressant Discontinuation Syndrome.SSRI/SNRI antidepressants as a common and underappreciated cause of reduced libido; importance of clinician-supervised medication management rather than abrupt discontinuation.

How do psychological and relationship factors contribute?

Depression is one of the most powerful libido suppressants — both through its direct neurobiological effects and because the antidepressants used to treat it often have the same effect 5Ref 5O'Connor E, Henninger M, Perdue LA, et al. (2023).Screening for Depression and Suicide Risk in Adults: US Preventive Services Task Force Recommendation Statement.Depression as a common contributor to reduced libido and sexual dysfunction; screening and treatment as part of comprehensive low libido evaluation. Anxiety, chronic stress, burnout, and poor sleep all reduce desire in ways that feel physical but have a substantial psychological component.

Relationship factors matter too: unresolved conflict, poor communication, feeling emotionally disconnected from a partner, or a significant mismatch in desire levels between partners can all manifest as reduced individual libido. These causes are equally worth addressing. Individual therapy, couples therapy, or sex therapy can be highly effective when psychological and relational factors are central 5Ref 5O'Connor E, Henninger M, Perdue LA, et al. (2023).Screening for Depression and Suicide Risk in Adults: US Preventive Services Task Force Recommendation Statement.Depression as a common contributor to reduced libido and sexual dysfunction; screening and treatment as part of comprehensive low libido evaluation.

When should you see a clinician?

If your libido has been noticeably lower for more than a few weeks and it is affecting your relationship, self-image, or quality of life, that is reason enough to get evaluated. There is no threshold of 'low enough' that earns a visit — this is about what is normal for you and what you want.

A primary care clinician can do the initial hormonal workup — testosterone, thyroid, prolactin, and glucose — and often manage common causes directly, referring to endocrinology, urology, or mental health support as appropriate 1Ref 1Mulhall JP, Trost LW, Brannigan RE, et al. (2018).Evaluation and Management of Testosterone Deficiency: AUA Guideline.Low testosterone as a common hormonal cause of reduced libido; diagnostic workup including testosterone, LH, FSH, prolactin; treatment considerations; obesity and prolactinoma as causes2Ref 2Jonklaas J, Bianco AC, Bauer AJ, et al. (2014).Guidelines for the Treatment of Hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement.Thyroid disorders as a cause of fatigue and reduced libido; TSH testing as part of low libido workup.