Causes of Fatigue in Men: Why You Feel Tired All the Time

Seven hours of sleep. Two cutting chais before 3:30. And you've now read the same line of the same email four times. Sunday was supposed to fix this, and it didn't.

For most men, the list of suspects is shorter than Google makes it look. Sleep that seems fine but isn't, usually because of sleep apnoea, sits right at the top of it, with low B12 and low vitamin D. Behind them come anaemia, creeping blood sugar, a slow thyroid, and depression that doesn't feel like depression. Low testosterone is on there as well, just further down than Instagram would have you believe. Most causes of fatigue in men turn up on one blood report, which beats guessing every time.

Tired or Sleepy? Start With This.

Your doctor will ask this first, so it's worth working out before you go.

Sleepy means your eyes close on you. It happens halfway through a Zoom call, or at a long signal on the drive home. If it's the second one, don't sit on it. That usually means the problem is the sleep.

Fatigue is different. Your legs are heavy on the stairs, and your thinking is slow, but when you lie down, sleep doesn't come. With that kind of tired, a doctor will look at your blood report and your mood before your sleep schedule.

Most men have some of each. Just tell the doctor which one wins on most days.

Why Am I Always Tired If I Sleep Enough?

Eight hours in bed doesn't mean eight hours of the deep kind.

For men, the usual suspect is obstructive sleep apnoea. Your throat muscles relax too far at night, and the airway partly closes. Breathing stops for a few seconds, the brain half-wakes you to restart it, and by morning you remember none of it. Some men go through this dozens of times an hour and only know they never feel rested. Often it's your wife who spots it first, because the snoring stops for a few seconds and then starts again with a gasp, sometimes many times a night.

A thick neck and a paunch make it likelier, and so does a peg or two before bed. No blood test will pick it up; you need a sleep study, either in a lab or with a kit at home. Treatment, usually a CPAP machine at night, tends to make a difference quickly.

Night shifts are their own problem, because sleeping at 9 am with sun through the curtains and horns outside gives you shallow, broken sleep even when the hours add up. Late chai counts too.

Vitamin Deficiency and Fatigue: A Very Indian Problem

Vegetarians, this section is mostly for you.

Your body gets B12 from animal foods, and a plate of dal and roti carries none of it essentially. Milk and curd help, but not enough. Chicken twice a week doesn't fully cover non-vegetarians either.

Low B12 tires you out partly through anaemia, since your blood ends up carrying less oxygen. Nerves need it too. That's why tingling feet, or forgetting what you walked into the kitchen for, can show up long before anyone orders the test. Years on metformin, or a pantoprazole every morning, both cut how much B12 you absorb, so ask for it to be checked.

Vitamin D is the other one, and yes, it's strange in a country with this much sun. Most office-goers leave before 9 and get home after 6, in full sleeves, and darker skin needs more sun to make the same amount. Low levels turn up alongside tiredness and body aches. For fatigue on its own, though, the evidence is thinner than the supplement ads let on.

Low iron is rarer in men, and that's exactly why a doctor takes it seriously. Women lose blood every month; men normally don't. So the real question is where it's going. Now and then the answer is a slow bleed in the stomach or gut. Getting breathless on one flight of stairs, or feeling your heart thump while you're sitting still, is reason enough to get tested this week.

Our view is simple: test first. Popping B12 does nothing for a thyroid problem, and if your B12 really is low, how much you need depends on the number on your report.

Blood Sugar and Thyroid Problems (and Your Medicines)

Undiagnosed type 2 diabetes is worth ruling out for any Indian man over 35 who's always tired, more so if a parent has it. High sugar leaves you heavy and thirsty, and getting up twice a night to pee doesn't do your sleep any favours. An HbA1c test settles it.

Men get underactive thyroids too. Alongside the fatigue, you might feel cold when everyone else in the room is comfortable, or put on weight without eating any more than usual, and a TSH test to check costs very little.

Then check what you take every day. Some blood pressure tablets (beta-blockers in particular) and the older allergy antihistamines can leave you flat, as can certain antidepressants. Don't stop anything on your own.

Is It Low Testosterone?

Fatigue and low energy in men get pinned on testosterone more than anything else. Sometimes rightly, often not.

Testosterone drifts down slowly with age, and when it's genuinely low, the tiredness comes with a lower sex drive and weaker erections. If tiredness is the only thing you've noticed, testosterone probably isn't your answer. More often it works the other way round: apnoea and belly fat drag testosterone down, as does regular heavy drinking, and men who deal with those tend to get some energy back along with it.

If you get it checked, timing matters. Testosterone is highest in the morning, so the blood should be drawn before about 10 am, and a single low result usually needs repeating. We'd also steer you away from gym "boosters" and steroid cycles. Testosterone taken from outside tells your body to stop making its own. In men planning a family, it can shut down sperm production too (we've covered what else affects sperm in our guide to improving sperm motility).

When Persistent Fatigue Is Really Your Mood

In men, depression often doesn't look like sadness. It shows up as exhaustion and irritability, or as losing interest in friends and the Sunday match, and some men start staying late at work to avoid going home. "I'm just tired" is easier to say at the dinner table, so that's what most men say. Two weeks of feeling this way is reason enough to see a GP or a counsellor. Depression responds well to treatment, and the sooner you go, the less of your year it takes.

Small Habits That Add Up

Not every cause needs a lab, and a few of the most common ones are sitting in your daily routine.

Summer heat dries you out faster than you notice, particularly on a two-wheeler or on site all day. By the time you feel thirsty, you're already behind, so keep a bottle on the desk and another on the bike. Then there's lunch. Two helpings of rice with something fried on the side is a reliable recipe for the 3 pm slump. Swap some of that rice for dal or paneer (eggs work too), and the slump usually shrinks.

Then there's alcohol. A couple of drinks help you drop off and break up the second half of the night. Ten hours in a chair also leaves you more tired rather than rested. Try 20 minutes of walking after dinner; it's one of the rare habits that helps your blood sugar and your sleep at once.

Tests Worth Asking Your Doctor For

If you've been tired for more than a few weeks, most doctors start with the tests below, and nearly all of them can be drawn from a single blood draw.

All normal and still wiped out? Push back a little on "it's just stress" and ask whether a sleep study makes sense.

Once a deficiency is found and treated, some men want daily support while they rebuild their habits. That's who Neujoy's Male Vitality & Energy Core is made for. 

Signs You Shouldn't Wait

Losing weight without trying, or waking up with the sheets soaked, means booking an appointment this week. Black, tarry stools mean the same. Chest pain, or getting breathless while resting, needs a doctor today. If you've ever dozed off while driving, don't wait at all. If a low mood has turned into thoughts of not wanting to be here, please talk to someone today. India's Tele-MANAS helpline (14416) is free.

If you do only one thing this month, book the blood test. The causes of tiredness in men are rarely exotic. Someone just has to check.

Quick Answers

What are the most common causes of fatigue in men?

Bad sleep comes first, often from apnoea, with low B12 and vitamin D close behind. Anaemia and diabetes come next, and thyroid problems and depression are worth ruling out too. Low testosterone plays a part in some men, usually alongside a lower sex drive.

Why am I always tired even after 8 hours of sleep?

Usually because the sleep isn't restful. Apnoea, a drink at night and shift work can all spoil sleep while the hours look normal on paper. If your sleep really is fine, the next step is a blood test.

Can vitamin deficiency cause fatigue?

Yes, and in India it's one of the first things worth checking. Low B12 and low vitamin D are two of the most frequent findings when tired Indian adults get tested, and vegetarians are at higher risk for B12.

How long is too long to feel tired?

That depends. A flat week after a viral fever or a big deadline is just recovery. Past two to four weeks with no obvious reason, or if it keeps coming back, see a doctor.

Does low testosterone cause tiredness in men?

Sometimes. Real low T rarely turns up alone, though; a fading sex drive and weaker erections usually come with it. You'll need a morning blood test to know, plus a second one if the first comes back low.