For example, "Many people tell us that they vomit yesterday's food, " says Joel Saper, director of the Michigan Head-Pain and Neurological Institute in Ann Arbor.
Not only does forward head posture cause nerve pain, Collie says it can also create metabolic problems.
But Dr Jan van der Merwe, head of the Input Pain Management unit at St Thomas's Hospital, London, told BBC News Online it was difficult to take conclusive findings from looking at brain activity because so many things were happening at the same time.
Frequent icing, physical therapy and massage therapy helped her neck and hip, but didn't do much for the pain in her head.
Dr. Michelle Collie, director of Performance Physical Therapy in Rhode Island, says she started seeing patients with head, neck and back pain caused by mobile devices six or seven years ago.
"There was a lot of pain in reducing head count 50%, but we were quick to see the shift coming and couldn't abdicate our leadership, " says Duncan Niederauer, a Goldman managing director in equities.
You feel as if streaks of pain are running through your head, you thrash your body, you search for some escape but find none.
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Confronting the drug safety debate head-on, Pfizer will advertise its pain pill Celebrex to consumers for the first time in two years.
The four-day appeal hearing was told that she is in the final stages of MS, can only move her head, cannot swallow and lives in constant pain.
Types of injuries which would be sent to the Royal Cornwall Hospital include chest pains, strokes, head injury with loss of consciousness, severe abdominal pain and all severely ill children.
"I leave sad because of the pain of our people but with my head held high, " a teary-eyed Bachelet said in a brief farewell address from the La Moneda presidential palace in Santiago, Chile's capital.
He was hospitalized for his mysterious pain, and late at night fainted and hit his head.
Recently, neurologists have suggested that such blows to the head could be deceptively severe, even if the player does not feel any pain or show any symptoms.
He listened to the verdict with his head on this chest, sitting in a wheelchair that he uses to alleviate back pain.
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