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During a Twitch live stream with fans, the 49-year-old said he has 'diffuse large B-cell lymphoma Stage 4-A', according to Page Six, which reported the stream was captured and reuploaded by a Blink-182 fan account on YouTube.
Hoppus said: "My classification is diffuse large B-cell lymphoma Stage 4-A.
He continued: "I don't know how exactly they determine the four-part of it, but it's entered enough parts of my body that I'm Stage 4, which I think is the highest that it goes. So, I'm Stage 4-A."
Stage four means the cancer has spread from where it started to at least one other body organ.
The musician announced he had cancer last month, saying in a statement: "For the past three months I've been undergoing chemotherapy for cancer.
"It sucks and I'm scared, and at the same time I'm blessed with incredible doctors and friends to get me through this.
"I still have months of treatment ahead of me but I'm trying to remain hopeful and positive.
"Can't wait to be cancer free and see you all at a concert in the near future.
"Love to you all."
He has since been keeping fans updated on his condition, as well as providing updates on a garden that he's started creating since his diagnosis.
Talking to fans on Twitch after a previous appointment for treatment, he said: "How am I feeling today? I feel much better than yesterday.
"Yesterday was hellish for me and I woke up today feeling better. I went for a walk, and I had a decent breakfast, and I haven't felt like I was going to throw up today, so we'll take it as a win.
"On good days, I go do stuff. I went on a walk outside today and it was the first time I'd left my house in like... five days pretty much.
"But this round of chemo I wasn't totally stuck on the couch, miserable.
"I've actually watched movies and walked around and cleaned the house and hung out with my dogs.
"I didn't just feel like a poisoned electrified zombie leaning up against an electric fence like I did the rest, the past couple of rounds."