Testicular small can not be recovered, testicular small clinically known as testicular atrophy, mostly pathological phenomenon, the specific causes are as follows: 1, developmental anomalies, such as cryptorchidism, testicular hypoplasia, syringomyelia, etc., even after surgical treatment or drug intervention there are still some patients with testicular atrophy; 2, infectious diseases, such as viral orchitis, most of which appeared in the onset of 6 months after the testicular atrophy; 3, blood transport disorders caused by testicular atrophy, which can be seen in patients with chronic testicular torsion, testicular spermatic cord trauma; 4, physiological atrophy of the testicles, which can be seen in older men or patients with anti-androgen therapy.