Hi there...some men who are preoccupied and severely distressed with the size of their penis may be diagnosed with body dysmorphic disorder...Penile shortening is a phenomenon that is associated with certain medical and surgical conditions. These conditions include prostate cancer patients treated with radical prostatectomy, Peyronie's disease and congenital anomalies. There is also some evidence that erectile dysfunction may be an independent risk factor for shortening... Standard measuring techniques are necessary to diagnose... Consult nearest urologist they will do the needful.