Blink-182 star Mark Hoppus says he has cancer, saying the diagnosis "sucks and I'm scared".

The 49-year-old bass player and singer shared the news on social media, saying: "For the past three months I've been undergoing chemotherapy for cancer. I have cancer.

"It sucks and I'm scared, and at the same time I'm blessed with incredible doctors and family 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."

Hoppus posted a picture on his Instagram Story of him sitting in a hospital room alongside the caption: "Yes hello. One cancer treatment, please."

He did not say what type of cancer he had been diagnosed with.

Blink-182 was a pop punk band formed by Hoppus with guitarist and vocalist Tom DeLonge, and drummer Scott Raynor in 1992.

Hits such as What's My Age Again? and All The Small Things made it one of the decade's biggest bands, selling more than 50 million records.

DeLonge said on Twitter on Wednesday: "I too, have been aware of Mark's cancer diagnosis for a while now.

"And to add to his own words that he used today, I would also like to say that he is strong, and a super-human who is pushing through this difficult obstacle with a wide-open heart. #WeHaveHisBack."