Hormones and mood
Low Testosterone and Depression: Is It Your Hormones?
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed July 20268 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Low testosterone can contribute to low mood, irritability and lost drive in men, and the NHS lists these among its symptoms. But mood is a non-specific sign with many causes. A blood test is the only way to know whether your hormones are really behind how you feel.
Find the test that fits your symptoms →As of July 2026.“Does low testosterone cause depression?” is one of the most common questions men bring to a hormone test. This guide sticks to what the NHS and the research actually say, and to what a blood test can and cannot tell you.
You feel flat. Short-tempered over nothing. The drive that used to get you out of bed has gone quiet, and you cannot point to why. It is a fair question to ask whether your hormones are behind it.
1. Can low testosterone cause depression?
It can play a part. Testosterone is the main male sex hormone, and receptors for it sit in the brain regions that shape mood and motivation. When levels fall too low, some men feel it as low mood, irritability and a loss of drive. The NHS lists these among the symptoms it groups under the “male menopause”.
“mood swings and irritability… a general lack of enthusiasm or energy… poor concentration and short-term memory.”
— NHS, symptoms listed under the “male menopause”
The research points the same way, gently. A 2019 review in JAMA Psychiatry pooled 27 trials and 1,890 men. It found testosterone treatment was linked to a modest reduction in depressive symptoms compared with a dummy pill. The effect was real but small, and the authors urged caution.
So the honest read is this. Low testosterone can feed into low mood. It is rarely the whole story on its own.
2. The symptoms that overlap
Low testosterone and low mood share a lot of ground. That overlap is exactly why it is so hard to tell them apart without a test. The signs men most often report include:
- Flat mood and low motivation. A dip in the drive and enthusiasm that used to come easily.
- Irritability. A shorter fuse than normal, snapping at small things.
- Brain fog. Poor concentration and a fuzzy, slowed-down feeling, covered in our brain fog guide.
- Low libido. A drop in sex drive is one of the more specific pointers to hormones.
- Fatigue and poor sleep. Tiredness that rest does not fix.
If several of these ring true, our fuller guide to low testosterone symptoms in men walks through the warning signs in detail.
3. Low mood has many causes, not just testosterone
Here is the trap. Blaming your hormones feels tidy, but it is often wrong. The NHS is clear that mood swings and lost drive may come from stress, depression or anxiety rather than a hormone problem at all. Several other blood markers can produce the same flat, tired feeling.
- Thyroid. An underactive thyroid slows everything down and mimics depression. A thyroid blood test rules it in or out.
- Vitamin B12 and iron. Low levels of either drain energy and mood, and both are common and easily missed.
- Vitamin D. A shortfall is linked to low mood, especially through the darker UK months.
- Cortisol. The stress hormone. Chronic stress can flatten mood and lower testosterone at the same time, which our cortisol guide explains.
This is the whole reason to measure rather than guess. Two men with the same flat mood can have two completely different causes, and the fix for one does nothing for the other. Our guide to the physical causes of low mood covers the full checklist.
4. How to tell if it is your hormones
You cannot feel a testosterone level, so a symptom on its own proves nothing. A blood test turns a guess into a number. For a mood question, the markers worth reading together are:
- Total and free testosterone. The hormone itself, and the active fraction your cells can actually use.
- SHBG and cortisol. SHBG sets how much testosterone is free to work; cortisol captures the stress side.
- Thyroid, B12, iron and vitamin D. The non-hormone causes that produce an identical flat mood.
Timing matters for testosterone. Test in the morning, ideally before 10am and fasted, because levels are highest then and drift down through the day. Our guide to the best time to test testosterone covers the rules.
Testosterone and cortisol sit in Helvy’s Complete Male Hormones panel (£119), while thyroid, B12 and vitamin D sit in the General Energy & Wellness panel (£149). To check the mix that fits your symptoms, the build-my-test tool matches you to the right markers. All are home finger-prick tests, with results in about five working days from UKAS-accredited UK laboratories.
READY TO TEST?
Put a number behind how you feel
Helvy’s home blood tests read testosterone alongside the other markers that shape mood, with clear, plain-English context. So you can see whether your hormones are the issue, or whether something else is behind how you feel. Results in about 5 working days from UKAS-accredited UK laboratories.
Frequently asked questions
Can low testosterone cause depression?
It can contribute. Low testosterone is linked to low mood, irritability and lost drive, and the NHS lists these symptoms. A 2019 review of 27 trials found testosterone treatment gave a small reduction in depressive symptoms. But mood is non-specific, so a blood test is needed to know if hormones are the real cause. This is general information, not medical advice.
What are the mood symptoms of low testosterone in men?
The common ones are a flat mood, low motivation, irritability, a shorter temper, poor concentration and a drop in sex drive. None of these on their own proves your testosterone is low, because stress, thyroid problems and vitamin shortfalls cause the same feelings.
Could my low mood be something other than testosterone?
Very possibly. An underactive thyroid, low vitamin B12, low iron, low vitamin D and chronic stress all produce a similar flat, tired mood. The NHS notes that mood swings often come from stress, depression or anxiety rather than hormones. Testing several markers together is the only way to separate them.
Which blood test should I take for low mood?
For a mood question, it helps to read testosterone, cortisol, thyroid, B12, iron and vitamin D together, since any of them can be behind how you feel. The build-my-test tool matches you to the right markers. If a result is abnormal or you feel very low, speak to a qualified clinician.
Related guides
Low Testosterone Symptoms in Men
The warning signs your GP might miss, in plain English.
Low Mood: Physical Causes to Rule Out
The blood markers behind a flat, tired mood.
Cortisol Blood Test
How chronic stress flattens mood and lowers testosterone.
Male Hormone Guides
Every Helvy testosterone and male hormone guide in one place.
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