Cancer symptoms are often vague and subtle, making the condition hard to identify. Fortunately, knowing what to look for could be the first step towards prompt detection. Although lung cancer targets the pyramid-shaped organs in your chest, ‘key’ symptoms can also appear in your stomach, according to an expert.While a stubborn cough is an infamous warning sign of lung cancer, other parts of your body could break the news of the scary condition.According to Medical Negligence Solicitor Kim Jackson, from Patient Claim Line, ‘key red flag’ sign is cachexia.Cachexia, or weight loss, is the result of your body not absorbing all the fat, protein and carbohydrates from the foods you eat.People with lung cancer often find they are losing weight unintentionally, even if they are sticking to their normal diet.READ MORE: Acholic stools are ‘the most common’ sign of pancreatic cancer in ‘initial’ stages Lung cancer: ‘Key’ symptoms include cachexia or weight loss – expert. (Image: GETTY)Another reason why you might find yourself a few stones lighter comes down to burning calories faster than normal, according to Cancer Research UK.The charity states: ‘Scientists think that cancer releases chemicals into the blood. The chemicals contribute to the loss of fat and muscle.’What’s more, cachexia is considered quite prevalent, with the sign affecting around 60 percent of patients.’About 60 out of 100 people with lung cancer have a loss of appetite and significant weight loss at the time of their diagnosis,’ Cancer Research UK adds.DON’T MISS Scientists think that cancer releases chemicals into the blood that trigger weight loss. (Image: GETTY) Cancer signs and symptoms to look out for include bleeding. (Image: Express.co.uk)The doctor added: ‘Identifying lung cancer early means looking at risk factors, such as smoking, which causes 71 percent of all UK lung cancers, and considering a range of symptoms in those aged over 40, who smoke or have ever smoked.’However, it is prudent to remember that 10-15 percent of lung cancers develop in people who have never smoked.’Other important risk factors are exposure to asbestos, exposure to silica often through sandblasting or glass making, diesel engine exhaust, and aerosols inhaled while painting or welding.’Doctor Lee recommended speaking to your GP if you’re worried about any symptoms or having smoked your whole life.