Which actor/actress appears to be in pain while acting? Is this due to their method acting or their lack of skill as an actor?

Ricardo Montalban (1920–2009) was in constant pain due to a spinal injury he sustained while filming the 1951 movie “Across the Wide Missouri,” according to IMDb. Montalban was thrown from a horse onto a rocky surface while filming the movie. Doctors told him the injury was caused by a congenital condition that led to too much blood in his spine. Montalban developed a permanent limp as a result of the injury, but he managed to hide it while performing. Montalban was confined to a wheelchair after the surgery and as a result of the injury. Despite the pain, Montalban continued to act, appearing in the Aaron Spelling TV series “Heaven Help Us” in 1994. He never retired from acting until his death. If misery loves company, Montalban had that. According to the website for the Spine and Orthopedic Center, .Charlize Theron developed chronic back pain after a fall and injury. Acting was put on hold so she could have surgery which was a success. George Clooney has had several surgeries to address chronic back pain flare-ups. After a filming injury, Clooney’s back pain became constant. After years of suffering, Clooney tried spinal fusion surgery. He still experiences flare-ups but the surgery alleviated severe pain and symptoms. Sarah Michelle Geller, star of “Buffy the Vampire Slayer” which ran from 1997 to 2003, suffered from scoliosis. She opted to treat her back pain non-invasively. Pilates, running, and personal training improved her core strength which helped to relieve pressure and pain from her back. The Everyday Health website revealed that Patrick Stewart, known to generations for his roles as “Star Trek: The Nest Generation’s” Captain Picard and Professor X in the “X-Men” movies, went public in 2017 to share that he uses medical marijuana daily to relieve pain from the genetic osteoarthritis in his hands. Edibles, sprays, and ointments “significantly reduce the stiffness and pain” in his hands, he said. In the same website, its was reported that Lady Gaga has fibromyalgia. “When my body goes into a spasm, one thing I find really helps is infrared sauna,” she said. “They come in a large box form as well as a low coffin-like form and even some like electric blankets. I combine this treatment with silver mylar emergency blankets that trap in the heat and are very cheap. In order to not overheat my system and cause more inflammation i follow this with either a very cold bath, ice bath or the most environmentally savvy way is to keep many reusable cold packs in the freezer (or frozen peas and carrots! and pack them around the body in all areas of pain.”