Often it's not possible to identify the cause of back pain. Doctors call this "non-specific" back pain.
Sometimes the pain may be a result of an injury such as a sprain or strain, but often it occurs for no apparent reason. It's very rarely caused by anything serious.
Occasionally back pain can be due to a medical condition such as:
a slipped (prolapsed) disc – where a disc of cartilage in the spine presses on a nearby nerve
sciatica – irritation of the nerve that runs from the pelvis to the feet
These conditions tend to cause additional symptoms – such as numbness, weakness or a tingling sensation – and they're treated differently to non-specific back pain.
Being overweight may not be as unhealthy as it was 40 years ago," BBC News reports. New research has found a body mass index (BMI) of 27 is linked to the lowest rate of death – but someone with a BMI of 27 is currently classed as being overweight. BMI is a score calculated by dividing your weight (usually in kilograms) by the square of your height (usually in metres and centimetres). Currently, a BMI of 25 to 29.9 is classified as being overweight. Researchers looked at 120,528 people from Copenhagen, recruited from 1976 to 2013, and separately compared those recruited during the 1970s, 1990s and 2000s. They were followed up until they died, emigrated, or the study finished. The BMI linked to the lowest risk of having died from any cause was 23.7 in the 1970s group, 24.6 in the 1990s group, and had further risen to 27 in the 2003-13 group. It may be the case that the suggested upward shift in optimal BMI is the result of improvements in preventative treatments for weight-rela...