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At a young age of 17 and having arthritis like symptoms is a concern. High ESR indicates that there is an infection or inflammation. Even severe anaemia can cause because you say you are underweight
. How are your Haemoglobin
levels. You need to get an X-ray of the legs to look for the problem. Do you have any difficulty in vision, any small swellings on the elbows. High ESR and weight loss
can also point to Tuberculosis
and you may get tested for this as well. You need to eat a diet rich in proteins like eggs, pulses, cereals, nuts, soyabean and drink plenty of water. Eat green leafy vegetables for antioxidant effect. You may consume Warm milk with added 1/4 spoon of turmeric which will provide some relief to the joint pains
due to NSAID effect. Kindly keep me posted on your problem.