From 5- 6 months I have noticed click click or cracking sound in my joints specially knee and shoulder joints. Now from 2 - 3 months this is become painful. Pain is increasing dad by day . Pain increases when I do some work or when I do exercise .. My doctor advised me not to do heavy work lift lifting playing pushing he advised me to take rest . He said my muscles are very weak. He prescribe me tendomac tab. , Pain reliever ans calcium tab. Pls explain me what is the problem with my joints