It is usually the back itselfStrong evidence
For nearly all low back pain no single damaged structure can be found, and only a small proportion has a cause such as a fracture, cancer or an infection; the NHS names a pulled muscle as a common cause. In 1,172 people with new back pain in Australian primary care, 0.9% had a serious cause.
Men report somewhat less back pain than women at every age: about 5,520 against 9,330 per 100,000 worldwide in 2020, in estimates modelled from population data. Men also see their GP less: across 446 UK general practices, men's consulting rate was 32% lower than women's, most of all between 16 and 60, though it was similar when men and women had comparable illnesses, and women were slightly more likely to seek care for back pain in 11 surveys.
Sources 1, 2, 3, 4, 5, 6
Work and liftingMixed evidence
Work carries more of men's back pain in the modelled estimates: work factors such as lifting, bending and long spells sitting or standing accounted for 34.3% of the low back pain burden in men aged 15 to 49, the highest share of any group, and smoking for 28.8% in men aged 50 to 69. These are modelled estimates with wide uncertainty, not measurements of any one man's back.
In 8 studies that followed workers over time, the odds of new back pain rose by about 11% for every extra 10 kg lifted and 9% for every extra 10 lifts a day. But a review of 35 studies found conflicting evidence that lifting at work causes back pain, so whether it does is still debated. In the short term, a heavy load was a strong trigger for a new episode, more so in younger people (the odds were about 13.6 times higher at 20 and 2.7 times at 60), and being distracted during a task was the strongest trigger of all.
Sources 4, 7, 8, 9
The kidneys and the testicles
Kidney stones were reported by 10.6% of US men against 7.1% of women in a national survey. They cause severe pain that comes and goes in waves, starting in the side or lower back and sometimes spreading to the groin or testicles. Urine infections are less common in men than in women, but a kidney infection causes the same pain in the side or back with a high temperature and pee symptoms. Blood in your pee always needs an urgent GP appointment or NHS 111, and the NHS kidney cancer page adds a pain in your back under the ribs that doesn't go away.
A twisted testicle (testicular torsion) causes sudden, severe testicle pain, sometimes with tummy pain and being sick, and needs A&E straight away. Epididymitis, an inflamed tube behind the testicle, causes testicle pain and swelling, and testicular cancer usually causes a lump or swelling, sometimes with an ache in the back or lower tummy.
Sources 10, 11, 12, 13, 14, 15, 16, 17, 18
The prostateEmerging evidence
Prostatitis, an inflamed prostate, is common: symptoms affect about 8 in 100 men in population surveys, and about a third clear within a year. The NHS prostatitis page lists pain in the penis, scrotum, testicles or bottom, pain when peeing or ejaculating, difficulty peeing and a high temperature; it doesn't list back pain. Prostate Cancer UK does: it lists the lower back among the places long-lasting prostatitis (chronic pelvic pain syndrome) can hurt, and among the places sudden bacterial prostatitis can hurt, along with a high temperature.
Prostate cancer often has no symptoms at first. The NHS says lower back pain and losing weight without trying may be symptoms of advanced prostate cancer, and the National Institute for Health and Care Excellence (NICE) suggests a prostate-specific antigen (PSA) blood test for urinary symptoms, erection problems or visible blood in the pee, not for back pain alone.
Sources 19, 20, 21, 22, 23, 24
Inflammatory back pain, an aneurysm and your bones
Inflammatory back pain (axial spondyloarthritis, which includes ankylosing spondylitis) is diagnosed more often in men, but NICE says it affects a similar number of women as men, and in a pooled analysis men were diagnosed about 7 months sooner. It usually starts in early adulthood, is worse in the morning and at night, and eases with exercise rather than rest.
An abdominal aortic aneurysm, a swelling of the main blood vessel in the tummy, often causes no symptoms. It is most common in men aged 65 or over and in people who smoke or used to, so the NHS invites men for one ultrasound scan in the year they turn 65, and about 1 in 80 men screened has a small one. A burst aneurysm causes sudden, severe pain in the tummy or back and is a 999 emergency. NICE adds that in women, aneurysms are more likely to burst.
Men get osteoporosis too: the NHS links it with low testosterone, steroid tablets and heavy drinking, about 31% of hip fractures in England are in men, and NICE names hormone treatment for prostate cancer that lowers testosterone (androgen deprivation therapy) as a fracture risk factor.
Sources 25, 26, 27, 28, 29, 30, 31, 32, 33, 34
When a scan or test helpsStrong evidence
Ordinary back pain doesn't need a scan: NICE advises against routine imaging, and disc bulges were found in 30% of pain-free 20-year-olds and 84% of 80-year-olds. Tests answer specific questions: a urine test for an infection; a computerised tomography (CT) scan for a suspected kidney stone; a PSA test and an examination when there are urinary symptoms, erection problems or visible blood in the pee; an urgent ultrasound for unexplained or lasting testicle symptoms; a tummy ultrasound for an aneurysm, offered once to men at 65; and hospital care straight away for the cauda equina warning signs.
Sources 35, 36, 13, 11, 24, 29
How it usually goesStrong evidence
New back pain usually improves a lot within 6 weeks: across 33 studies, average pain fell from 52 out of 100 to 23 at 6 weeks and 6 at a year. It often comes back: 69% of people who had recovered had another episode within a year, and more than 5 hours' sitting a day was one of the things that predicted it. Prostatitis symptoms clear within a year in about a third of men, bacterial prostatitis usually feels better within 2 weeks of starting antibiotics, and most kidney stones can be treated at home with medicine, taking a few weeks to pass. No one can promise a timescale.
Sources 37, 38, 19, 20, 11