There are many reasons why the legs are getting thinner and thinner: first of all, it may be stomach disease, stomach disease can easily lead to malnutrition, malnourished people usually have wasting, loss of appetite, less fat gain in the body leads to thinner and thinner legs, people with poor gastrointestinal absorption are prone to malnutrition, especially patients with gastrointestinal cancer and gastroenteritis have increasingly thin legs is particularly common. Secondly, the legs are getting thinner and thinner may be the disease of myasthenia gravis, myasthenia gravis will lead to muscle atrophy, this symptom should not be taken lightly, otherwise muscle atrophy will become more and more serious or even leg insensibility. You need to go to the hospital in time for diagnosis and appropriate exercise to enhance the immunity of the body, but also through acupuncture and massage to improve, if you need drugs for supplementary treatment, you need to consult a doctor before taking drugs.