A mother who was diagnosed with stage 4 lung cancer at just 34 years old has outlined five symptoms that she ignored and doctors misdiagnosed, and urged others to act on the warning signs when they appear. A mother who was diagnosed with stage 4 lung cancer at just 34 years old has outlined five symptoms that she ignored and doctors misdiagnosed, and urged others to act on the warning signs when they appear. Health & Fitness Daily Record – Health & Fitness