Why a sneeze or cough hurtsEmerging evidence
A sneeze or a cough is a sudden, forceful squeeze of the trunk: the breathing and tummy muscles fire hard, and the pressure inside the tummy rises steeply. In 20 healthy young adults, a cough raised it to 107.6 mmHg on average, against 16.7 sitting and 20 standing. In a laboratory study of 12 healthy young men, most curled forward at the moment of a sneeze, and in one volunteer with a pressure sensor in a lumbar disc, the pressure was recorded during sneezing as well as other daily activities.
A back that is already irritable, whether from a strained muscle or joint, a disc pressing on a nerve or a broken rib, protests at that sudden load; a calm back usually doesn't. The NHS says sciatica 'may be worse when moving, sneezing or coughing', and pleurisy, an inflamed lining around the lung, causes sharp chest pain that may be worse when you cough or sneeze and can spread to the shoulders and back.
Sources 1, 2, 3, 4, 5
What it does and doesn't meanStrong evidence
Usually it is ordinary back pain, a strain or a spasm, or a disc and sciatica if the pain shoots down a leg. A sneeze can set off a back spasm, but no study we found has counted how often; the published reports are rare injuries described in single case reports.
It is a reason for a GP check, not panic: the NHS lists back pain that is 'worse when sneezing, coughing or pooing' among its reasons to see a GP, not among its urgent ones, and Arthritis UK says to seek advice sooner for it. Many people with a disc or sciatica have this. In people with sciatica, more pain on coughing, sneezing or straining was one of the findings that predicted a slower recovery, but no single symptom confirms a disc, and disc bulges are common on scans of people without pain.
With cancer, now or in the past, it is a same-day matter: the National Institute for Health and Care Excellence (NICE) lists back pain made worse by straining, such as coughing, sneezing or opening your bowels, among the features suggesting cancer has spread to the spine.
Sources 6, 7, 8, 9, 10, 11, 12
Thin bones, ribs and long coughsEmerging evidence
With thin bones, the NHS says a cough or sneeze can cause a broken rib or the partial collapse of one of the bones of the spine. In 54 people with ribs broken by coughing, 78% were women, 85% had coughed for 3 weeks or more, and 17 of the 26 who had a bone density scan had low bone density, though it can happen with normal bones; in another 90 people, 64% were past the menopause.
People with chronic obstructive pulmonary disease (COPD) have more spinal fractures: 20.5% of 1,239 smokers and people with COPD had one on a scan. Long-term steroid tablets went with more spinal fractures in COPD (about 2.3 times the odds), and NICE names COPD as a fracture risk factor. In adults, whooping cough can bring weeks of coughing bouts and sore ribs.
Sources 13, 14, 15, 16, 17, 18, 19
Other causes to know
A hernia, a lump in the groin or tummy, may get bigger when you cough or sneeze and smaller when you lie down. Hay fever, colds and a long-lasting cough mean more sneezes and coughs, and more chances for a sore back to catch. Leaking when you sneeze or cough often goes with back pain: in a survey of 38,050 women, frequent leaking and breathing problems were more strongly linked with frequent back pain than weight or activity, though a survey shows a link, not a cause.
Sources 20, 21, 22
When a scan or test helpsStrong evidence
Usually none: NICE advises against routine imaging for back pain. An X-ray, or a spine check with a bone density scan, helps when a spinal fracture is suspected. For a rib injury there's often no need for an X-ray, the NHS says, and the first chest X-ray showed only 58% of ribs broken by coughing. A GP may arrange an X-ray or a breathing test for a cough that won't go away, and a magnetic resonance imaging (MRI) scan if a slipped disc isn't getting better. After a bone breaks from a cough or sneeze, ask about a bone health check.
Sources 23, 24, 25, 14, 26, 27
How it usually goesStrong evidence
Strains and spasms: most new back pain improves a lot within 6 weeks (across 33 studies, average pain fell from 52 out of 100 to 23 at 6 weeks). Sciatica usually gets better in a few weeks to a few months. Bruised or broken ribs usually get better by themselves within 2 to 6 weeks, and a spinal fracture heals in 6 to 12 weeks. Most coughs clear within 3 to 4 weeks, but whooping cough bouts can last weeks to months. No one can promise a timescale.
Sources 28, 4, 25, 29, 26, 19