Thanks for your question on Health Care Magic.
I can understand your situation and problem.
Painless, bright red bleeding from anus is mostly due to piles (hemorrhoids) and anal canal
Best way for diagnosis is locale site examination of anus.
If on local examination dilated veins are seen than it is piles.
But if nodule or mass or ulceration are seen than possibility of anal canal cancer is more.
For all these you need to consult doctor
and get done clinical examination of your anus. You may require proctoscopic examination also.
So consult doctor and discuss all these.
Hope I have solved your query.
Wish you good health. Thanks.