The 19-year-old had to withdraw from her game against Switzerland’s Viktorija Golubic with what appeared to be a problem with her side.
It comes as world No. 3 Alexander Zverev underwent surgery on torn ligaments in his right ankle, which will almost certainly exclude him from Wimbledon.
The grass track major will begin on June 27, and while Zverev is unlikely to recover, Raducanu says she has “no idea” whether she will compete.
“First game, absolute freak. I think I drew something. I don’t know exactly what happened. I just came off the track,” Raducanu told reporters after the game.
“It’s on the side of my body. It feels, I don’t know, maybe around my rib or something.
“It could just be stuck and cramping and then it’s really bad for a few days. But I have no idea. I can’t diagnose myself, so I’m having it checked.”
She has not been able to find consistency since her breakthrough year and is currently without a coach.
Zverev starts rehab
Meanwhile, Zverev is already undergoing rehabilitation after his surgery.
The 25-year-old is on the hunt for the first grand slam trophy of his career but will have to wait for his injury to recover.
“After further investigation in Germany, we received confirmation that all three lateral ligaments of my right ankle were torn.
“To get back to competition as soon as possible, to make sure all ligaments heal properly and to regain full stability in my ankle, surgery was the best choice.
“My rehab starts now and I will do everything I can to come back stronger than ever!”