Are daily headaches, nausea, numbness in limbs, shortness in breath, weight loss, drowsiness and loss in appetite signs of cancer in teenagers?

Cancer: Your symptoms need to be evaluated by your doctor and requires a hands on examination as well as blood work and possible x rays

See a Dr. : You need an evaluation. There are multiple symptoms and multiple possibilities here including symptoms resulting from poor lifestyle habits, like poor nutrition, poor sleep habits, even depression. Get checked out but stay calm. Cancer would not be high on the list.