I have been getting headaches lately from not sleeping , could this be a sign of a brain tumor?

Not usually: Headaches from not sleeping would be from not sleeping and not usually a brain tumor. Get some more sleep, and if the headaches continue, then see a neurologist. Good luck.

Unlikely: Get 7-8 hours sleep a day for 2 weeks and see if headaches go away. Sleep deprivation can cause headaches and other symptoms

Unlikely: While tumor can cause headaches, it is unlikely. Instead try getting some sleep. Common causes include caffeine withdrawal, dehydration, migraines, sinus infection, high blood pressure, and stress.