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Libido and testosterone: what is normal and when to see a doctor

6 min read

The NHS's list of common reasons for low sex drive is mostly stress, mood, alcohol, health conditions and medicines. Testosterone can matter too, but it takes blood tests to know, and one test isn't enough.

This is general information from health bodies, not medical advice. If something feels off and keeps feeling off, a doctor is the right next step.

Normal varies a lot

There's no correct amount of desire. Some people think about sex daily, some a few times a month, and the same person changes across months and years. A dip during a stressful stretch at work, after a breakup or in a new relationship isn't a diagnosis. What counts as a concern is a lasting change that bothers you, or one you didn't expect.

The NHS lists the common reasons for low sex drive:

Its advice is blunt: "Treating the cause should help increase your sex drive." (NHS, "Low sex drive (loss of libido)," last reviewed 26 May 2026.)

The everyday suspects

Before testosterone, the list above has a few things you can check yourself.

Stress and mood. Work pressure, money worries and low mood all show up in desire. If you also feel flat, sleep badly or have lost interest in things you liked, that's worth raising with a doctor too. See depression, stress, anger and dating and therapy for guys for how people approach that.

Sleep and tiredness. Feeling run down is a common companion of low desire. Sleep and social energy covers practical routines.

Alcohol. The NHS names drinking too much as a cause. Drinking and dating covers how to cut back without making it weird.

Medicines. Some blood pressure medicines and antidepressants are on the NHS list. If you think a medicine is affecting you, tell the doctor who prescribed it. Don't stop taking it on your own.

The relationship. Desire is partly about how things are going with the other person. If your drive is fine alone but dips with a partner, or the reverse, that's information. Mismatched sex drives goes into that.

What testosterone does and doesn't explain

Testosterone is a hormone that affects desire, energy, muscle and mood, and levels fall slowly with age. The NHS says testosterone falls by "about 1% a year from around the age of 30 to 40," and that it isn't a sudden drop like the female menopause. It calls late-onset hypogonadism "an uncommon and specific medical condition" that isn't a normal part of ageing.

The term for a diagnosed shortage is hypogonadism. The Endocrine Society's patient page says: "Male hypogonadism is a combination of low testosterone levels and the presence of any of these symptoms." The listed symptoms include reduced sex drive, erectile dysfunction, lower sperm count, breast enlargement or tenderness, reduced energy, reduced muscle mass, testicle shrinkage, irritability or low mood, and hot flashes.

Look at that list again. Almost every item also fits stress, poor sleep, depression or a medicine. A symptom on its own doesn't tell you your testosterone is low. That's why the Endocrine Society defines the condition as low levels plus symptoms, not symptoms alone, and why testing beats guessing.

How testing works

According to the Endocrine Society (page updated January 24, 2022):

So a single reading from a home kit or a late-afternoon lab doesn't settle it. The tests are timed for early morning, and the repeat is built into the process.

Treatment, and the part about supplements

If low testosterone is confirmed, a doctor may prescribe replacement therapy. The Endocrine Society says it "can be treated with the use of doctor-prescribed testosterone replacement therapy," and that "some conditions that cause hypogonadism, such as obesity, can be reversible without testosterone therapy." It describes injections, gels and patches among the forms. The NHS says that if a deficiency is confirmed you may be offered replacement, given as an injection or a gel.

The FDA's testosterone information page (current as of 06/23/2026) says the agency has asked for label updates after the TRAVERSE trial, a safety trial that enrolled more than 5,200 men. The updates include removing a limitation-of-use statement about age-related hypogonadism and revising safety information on prostate cancer and benign prostatic hyperplasia. That's a decision for you and a doctor, with your health history in front of them.

Two things to avoid:

When to see a doctor

See a doctor if:

The NHS tells people to see a GP if they're worried about low sex drive, and says the same if you think a medicine is the reason. The NHS says a GP can advise you about help and any treatments that might increase your sex drive, and the causes it lists go well beyond hormones, so expect questions about more than testosterone.

If it turns out something is going on, dating with health concerns covers when and how people bring that up with someone new.

What to do next

  1. Write down for two weeks: your sleep hours, drinks, stress level (1 to 5) and how your desire felt. It helps a doctor and shows you patterns.
  2. Cut back drinking for two weeks and see whether energy and desire change.
  3. List every medicine you take, including ones for blood pressure or mood, and bring the list to your appointment.
  4. Book a GP or primary care visit if the dip has lasted more than a few weeks. Ask what could be causing it, and whether a morning blood test makes sense.
  5. If a test is ordered, have it first thing in the morning as the Endocrine Society describes, and expect a repeat if the result is low.
  6. If this is making you hesitant about dating, treat it as a health question to sort out first. You don't owe anyone details until you choose to share them.

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