Tatum O'Neal is opening up about her battle with rheumatoid arthritis.

The 56-year-old Oscar winner, who was diagnosed with the painful disease at age 50, took to Instagram on Wednesday to share a photo of her back, which was covered with multiple bruises and surgery scars.

"Living with rheumatoid arthritis," O'Neal wrote in her caption. She went on to detail the origin of each of her scars.

"A fall scratch scar on my right hip. And the back surgery scar from eight years ago. My last back surgery scar is on the front from February. And all those red marks are from heating pads. I probably should turn those down a little bit, " she wrote.

"Believe it or not this is me actually getting better," the actress revealed. "Cheers to everyone and rheumatoid arthritis can go f--- itself."

She added the hashtag #rheumatoidarthritiswarrior.

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