Low libido: the common causes worth ruling out first

What counts as low libido

There is no correct amount of sexual desire. What matters clinically is change and distress: a noticeable drop from your own usual level, sustained over weeks or months, that bothers you or affects your relationship. Desire that is simply lower than a partner’s, or lower than what films and pornography suggest is typical, is not in itself a medical problem.

Desire also has a wide normal range across a lifetime. It commonly dips during periods of high stress, poor sleep, new parenthood, illness, and in the years around the menopause or with age-related hormonal change in men. Those dips are expected rather than pathological.

The causes worth ruling out first

Sleep and stress

Chronic short sleep and sustained psychological stress are the two most common contributors, and the two most often dismissed. Both affect the hormonal and neurological systems involved in arousal, and both tend to arrive alongside fatigue and low mood, which compound the effect.

Medication side effects

A large number of routinely prescribed drugs affect desire or arousal, including several classes of antidepressant, some blood pressure medications, hormonal contraceptives in some people, and certain treatments for prostate conditions. This is worth checking early, because the timing usually gives it away: if desire changed within weeks of starting or changing a medication, that is a strong clue.

Hormonal causes

Thyroid dysfunction, low testosterone in men, and the hormonal shifts of perimenopause in women can all reduce desire. These are straightforward to test for, though results need interpreting alongside symptoms rather than in isolation, and a single borderline value is rarely enough to act on.

Mood and mental health

Depression reduces desire directly, and several of its treatments reduce it further. Anxiety interferes differently, through intrusive worry and difficulty staying present. Both are treatable, and treating them usually helps.

Relationship context

Unresolved conflict, resentment, and a sense of obligation rather than choice all suppress desire reliably. This is not a lesser cause than a physical one, and it is often the one people are least willing to name at an appointment.

What a doctor will usually check

A typical first consultation covers your history and the timeline of the change, a review of all current medications, questions about sleep, mood and stress, and where indicated some blood tests — commonly thyroid function, and testosterone or other hormones depending on your situation. The pattern of when things changed often narrows the possibilities faster than any single test.

What actually helps

• Fix sleep first. It is unglamorous, it is often the largest single factor, and it makes every other intervention work better.
• Review medications with your doctor. A switch or dose change resolves a meaningful proportion of cases.
• Treat the underlying condition. Depression, thyroid disease and hormonal deficiency respond to treatment, and desire commonly recovers with them.
• Address the relationship, not just the body. Where conflict or pressure is part of the picture, sex therapy or couples work is the appropriate route.
• Be sceptical of supplements. The evidence behind most libido products sold online is weak to absent, and some interact with prescribed medication.

When to seek help sooner

Book an appointment rather than waiting if the change was sudden, if it came with other symptoms such as fatigue, weight change, pain or low mood, if it followed a new medication, or if it is causing you real distress. Earlier assessment tends to mean a simpler explanation and a simpler fix.