The Blues midfielder posted a photo of himself on Twitter of him receiving the treatment also known as cupping, where heated glass cups are used to draw blood through small incisions.Williams famously underwent hijama after the 2015 Rugby World Cup final and it is believed to help alleviate aches and pains. It is unsure whether the method will help with concussion.Williams left the field just before halftime in the Blues’ 40-33 Super Rugby victory over the Waratahs in Sydney on Saturday night for a head injury assessment, and never returned. Williams told Australia’s Daily Telegraph how he was faring.”God willing I’ll be all right, and I’m sure I will be,” Williams told the Daily Telegraph. “The doctors did a great job, I passed the test at halftime but they said because I still felt a bit foggy it was better for me to sit down.”Now there’s a lot more studies around it, they’ll pull you off instead of State of Origin style and chuck you out there.”I remember the Mark Carroll days where you get up and try to keep going.”Dr Mark Fulcher, medical director of New Zealand Football, told Stuff in 2015 there is little scientific evidence to support claims hijama helps aches and pains.”My thoughts are it doesn’t really do very much,” Fulcher said.”It’s a good way to get a whole bunch of bruises, but I don’t think it really helps with injury. There are a few studies out there which pretty much conclude that it doesn’t do anything.”Dr Hamish Osborne, senior lecturer of sport and exercise medicine at the University of Otago, also spoke to Stuff in 2015 and said such alternative practices are common place in sports medicine and likened hijama to having a massage.”People like having massages, so it’s doing something for them but there’s no clear evidence that it has benefited or enhanced performance,” he said. “Maybe it helps enhance recovery but even that’s hard to prove. “But athletes like being rubbed so it falls into that category there.” Both Fulcher and Osborne agreed that if Williams feels like he benefits from hijama then he should continue with the treatment. Although they won’t be recommending it to any of their patients. “If he believes it’s helping his aches and pain then it probably is because that’s a relatively modern understanding of pain,” Osborne said.”If somebody believes in a treatment and they are getting less pain from it then that’s a real affect. Will that work if you give it to 1000 people with pain, probably not. “For the people who it works for, it will work beautifully. How is that happening? No idea.” Fulcher added: “In high-end sport anything that makes you feel good can be effective but it’s certainly not a treatment that I would refer people for.” Photo: Hijama leaves circular red marks on the patient’s body – the effect of the suction involved in the ancient remedy.