New Found Glory guitarist and singer Chad Gilbert is back on the mend after doctors found three tumors in his brain.

In a post shared on Instagram ... Chad revealed he was losing control of his limbs last month, which led to him going to the ER to get a CT scan ... that's when doctors discovered the tumors.

According to Chad, he had a successful surgery to remove the tumors on February 27, and he's been recovering in the hospital ever since.

He wrote, "My radiation oncologist described it like this: 'this is not a fatal blow and not the end of your story, just the beginning of a new chapter.'"

Chad says that, although his recovery has been bumpy, he's getting stronger by the day.

This wasn't Chad's first serious health scare. He previously underwent treatment for a rare adrenal gland cancer known as metastatic pheochromocytoma, which had spread to his spine and lungs.

Glad to see you're doing better, Chad!