The short version
- Over 30 years and 49,999 seafarers, musculoskeletal problems were the most common diagnosis at Radio Medical Denmark: 18.8% of cases[1].
- More than half of one P&I club’s musculoskeletal cases involve back problems[3].
- Fishermen carry the heaviest load: studies put their low back pain prevalence at 61% to 82%, against 49% in a land-based population[2].
- Pain relief is 55.4% of all prescriptions at sea[5]. Back care is the medicine chest’s everyday job.
How common back problems are at sea
Two large datasets agree that the musculoskeletal system, and the back above all, is where much of the medical work at sea lands.
| Source | Scope | Finding |
|---|---|---|
| Radio Medical Denmark, 1995 to 2024[1] | 49,999 seafarers | Musculoskeletal 18.8%, ahead of skin (14.6%) and abdominal (11.5%) |
| Britannia P&I claims[3] | Crew claims, 2022/23 to 2023/24 | More than half of musculoskeletal cases involve back problems |
| CIRM work injuries, 2010 to 2022[4] | 793 injured seafarers | Overexertion lifting or carrying caused 14.8% of injuries; 19% on deck |
Radio Medical Denmark’s caseload grew from 240 consultations in 1995 to 4,829 in 2024, while the share needing disembarkation or evacuation fell from over 10% to about 5%[1]. Good advice at sea keeps most problems on board, including most backs.
Fishermen have it worst
A systematic review of 13 studies looked at how ship motion loads the lower back[2]. Comparing four studies that measured prevalence, it found:
| Group[2] | Low back pain prevalence |
|---|---|
| Fishermen (highest study) | 82.13% |
| Fishermen (lowest study) | 60.95% |
| Land-based population | 48.63% |
| Seafarers (one study) | 28.42% |
The authors point to heavy physical work during ship motion, such as handling nets and filleting, as a strong risk factor, and say prevention is likely the key to lowering illness[2]. For the wider fishing picture, see commercial fishing vessel medical requirements.
Where the strain comes from
- Lifting and carrying on a moving deck. Biomechanical studies in the review all described high strain from heavy tasks in moving environments[2]; overexertion causes 19% of deck injuries[4].
- Compensating for ship motion. Two biomechanical studies described extra effort needed to counter ship movement[2].
- Sitting. Officers sit 3.5 hours a day against 2.4 for ratings, and move less[6].
The injury picture by department is in the most common injuries on ships.
What the medicine chest needs for backs
In 11,698 prescriptions at Radio Medical Denmark, pain relief made up 55.4%: paracetamol 3,500 and NSAIDs 2,540, with 380 opioid prescriptions for severe pain[5]. That is the core of back care at sea.
| Item | Why, from the data |
|---|---|
| Paracetamol, deep stock | The most prescribed medicine[5] |
| An NSAID, one product | 2,540 prescriptions; too many overlapping products is a known error risk[5] |
| A short, lawful opioid list | For severe pain only, held under federal rules on US vessels[5] |
| Cold packs and a back brace or support | Supports first-line care aboard while advice is sought |
Stocking by usage data is set out in the medicines ships actually use and the controlled side in 21 CFR 1301.25 explained.
Who it hits: the crew picture behind the numbers
The Danish service’s caseload has changed with the crews it serves. Since 2014 the share of Danish seafarers fell from 38% to 15.1%, while Indian and Filipino seafarers rose substantially, and merchant vessels made up 55.7% of contacts, mostly in the North Sea[1]. The CIRM injury data shows the same working-age profile: injured seafarers averaged 39 years old, and deck ratings were the largest single group at 27.9%[4].
| Group | What the data shows | Back risk to plan for |
|---|---|---|
| Fishing crews | Low back pain 61% to 82%[2] | Net handling and processing on a moving deck |
| Deck ratings | 27.9% of injured seafarers; overexertion 19% of deck injuries[4] | Mooring, stores and cargo handling |
| Officers | 3.5 hours a day sitting[6] | Long watches and desk work |
| Engine crews | Engineers lead hand injury claims[3] | Awkward postures in tight spaces |
One plan does not fit all four. A fishing vessel needs lifting technique and team lifts first; a cargo ship’s officers need movement breaks; engine crews need tools and access that avoid twisting under machinery.
When a back problem is not routine
Get medical advice at once
Back pain after a fall or heavy blow, pain with numbness or weakness in the legs, or loss of bladder or bowel control is not a job for the medicine chest alone. Get medical advice straight away and decide on evacuation; see when to medevac a seafarer. A back injury that needs treatment ashore can also trigger US casualty reporting; see injury beyond first aid.
Five steps that cut back problems on board
- Team lifts and handling aids for heavy deck work, the task the data flags most[2][4].
- Plan heavy jobs for calmer sea states, since motion adds strain[2].
- Movement for officers who sit most[6].
- Report early, so pain is treated before it becomes an injury.
- Stock and review pain relief against what is actually used[5].
Discovery Health MD covers all three sides: a pain relief and back care stock sized to your crew through ship medical chest management, lawful opioids for severe pain through controlled substances management, and a physician-written back injury and escalation protocol through maritime medical consulting. Talk to us about back injuries in your fleet.
Common questions
How common is back pain among seafarers?
Musculoskeletal problems were the top diagnosis at Radio Medical Denmark over 30 years, 18.8% of cases[1], and more than half of one P&I club’s musculoskeletal cases involve the back[3].
Do fishermen get more back pain than other crews?
Yes. Studies put fishermen’s low back pain prevalence at 60.95% to 82.13%, above a land population (48.63%) and one seafarer study (28.42%)[2].
Why does working at sea hurt the back?
Heavy tasks in a moving environment create high strain, and crews need extra effort to compensate for ship motion[2].
What medicines are used for back pain at sea?
Pain relief is 55.4% of prescriptions at sea, led by paracetamol and NSAIDs[5]. Quantities by crew size are covered in how to stock a ship medicine chest.
How often does a back problem mean evacuation?
Across all diagnoses, Radio Medical Denmark’s disembarkation or evacuation share fell from over 10% to about 5%[1]. The study does not give a back-specific figure.
Which crew members are most at risk?
Overexertion lifting or carrying caused 19% of deck injuries[4]; officers sit more and move less[6]; and fishermen show the highest prevalence[2].
When is back pain an emergency at sea?
After a fall or blow, or with leg numbness, weakness, or loss of bladder or bowel control: get medical advice at once and consider evacuation. See first aid requirements for fishing vessels.
