I was cutting something with a sharp blade and it slipped and sliced into my thumb, I don't know how deep it is but it hurts heck and was bleeding a lot, I taped it up but am wondering if it needs medical attention or if it will be OK taped up?

Ive had this happen SEVERAL times... Just keep it taped up for a week or two, after like few days it wasent hurtin a lot so I took the bandaid off and walked up to the teacher and opened the wound back up. She passed out, and I was bleeding a lot  and got to go home, I did the classs and me a favor

Put your thumb under the cold tap to staunch the bleeding  and then dry it with a tissue.If your thumb is still bleeding a lot after this, you should have it checked out by the doctor as it might require stitches.

Janey is right. We can not see your thumb here, so consult a physician if pain and bleeding persists.