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7 unexpected signs you might have low testosterone, even if your sex drive feels fine

7 unexpected signs you might have low testosterone, even if your sex drive feels fine

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Published: January 12, 2026 at 11:17 AM

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When men think about testosterone, sex drive is usually the first thing that comes to mind. But this hormone affects far more than what happens in the bedroom.

According to the expert team at TRT UK, nearly two million men in the UK are thought to have testosterone deficiency, yet many are completely unaware. The symptoms often creep in slowly and are easy to blame on stress, work pressure or getting older.

If you have been feeling off lately, these less obvious signs could be worth paying attention to.

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You’ve lost muscle or feel physically weaker

Testosterone plays a key role in maintaining muscle mass and strength. If your workouts are not delivering the same results or everyday tasks like carrying shopping or climbing stairs feel harder, low testosterone could be involved.

When levels drop, the body struggles to repair and build muscle tissue, which can lead to gradual weakness.

Tip: Strength training two or three times a week, especially compound movements like squats or deadlifts, can naturally support testosterone. If you are training consistently with little progress, a hormone check may be worth considering.

Your hair growth has slowed down

Changes in facial or body hair are another subtle sign. Low testosterone can slow beard growth or cause patchier hair growth on the body.

This is different from male pattern baldness. Hair follicles spend longer in a resting phase, meaning regrowth after shaving can take much longer than it used to.

Tip: Sudden changes in hair growth, particularly alongside fatigue or weight gain, should not be ignored and are worth discussing with your GP.

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You’re struggling to concentrate or think clearly

Testosterone supports brain function, including memory, focus and motivation. When levels fall, many men describe feeling mentally foggy or less sharp.

This can show up as forgetfulness at work, difficulty concentrating or feeling mentally slower than usual.

Tip: Good sleep, hydration and cutting back on ultra-processed foods all support brain health, but persistent brain fog may have a hormonal cause.

You feel anxious, flat or irritable

Mood changes are one of the most overlooked symptoms of low testosterone. Men may feel emotionally flat, anxious or irritable without knowing why.

Testosterone helps regulate dopamine and serotonin, chemicals that influence mood and motivation. When levels dip, enjoyment and emotional resilience can disappear.

Tip: Chronic stress raises cortisol, which lowers testosterone. Small changes like daily walks, cold showers or short mindfulness sessions can help, but ongoing low mood should be checked.

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You’ve gained weight, especially around your stomach

Low testosterone often leads to weight gain around the waist. It also makes fat harder to lose, even if your diet and exercise have not changed.

This can become a cycle, as increased body fat can lower testosterone levels further.

Tip: Reducing sugar and alcohol, prioritising sleep and adding strength training can help rebalance hormones naturally.

You’re constantly tired, even after a full night’s sleep

Persistent fatigue that does not improve with rest is a common sign. Low testosterone affects how efficiently your body converts food into energy.

Many men wake up tired, feel drained throughout the day and crash early in the evening.

Tip: Track sleep, diet and activity for a couple of weeks. If exhaustion continues despite healthy habits, hormone testing is worth considering.

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You’ve lost your drive and ambition

Testosterone fuels confidence, motivation and a sense of purpose. When levels decline, many men feel like they have lost their edge or spark.

Work motivation, goal setting and enjoyment of hobbies can all fade, even if nothing else has changed.

Tip: Exercise, routine and social connection help support motivation, but if drive does not return, hormones may be the missing piece.

When should you get checked?

Low testosterone can affect men at any age, but it becomes more common after 35 and is often dismissed as stress or ageing.

The team at TRT UK says a simple blood test through a GP or hormone specialist can confirm whether testosterone levels are low and identify the cause. With the right treatment, many men report improved energy, mood and quality of life.

If several of these signs feel familiar, it may be time to stop guessing and get checked.