My left testis is bigger than right and hanging lower than right by 1/2 cm and sometime its paining. Is it a sign of cancer or any disease.

Hello Mohan... Cancer is a very huge diagnosis... and cannot be made on just a lower hanging testes. It is common to have some differences on both the sides and it may not be a major issue.. If you are masturbating then stop it, wear a good underwear. I think this should suffice. For more guidance you can consult me through lybrate. 

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Show to a surgeon. Small difference in size and one testis hanging lower than the other is normal. They would examine you and if needed get an ultrasound done. They need to rule out hydrocele, varicocele, spermatocele, hernia and testicular tumour. Fell free to contact me directly if you want to discuss this further.  

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