Brain cancer can start in the brain or travel there from elsewhere. Signs depend on where the tumor sits and how fast it grows.

Headache is the symptom people mention most. It often starts dull, wakes you at night, and feels worse when you bend over or cough.

Nausea and vomiting may show up with the headache, especially in the morning. The sick feeling can fade after you throw up, then return later.

Vision changes. You might see double, lose the outer edges of sight, or notice flashing lights even when your eyes are closed.

Weakness or numbness creeps in. One hand may drop things, an eyelid may sag, or one side of the face feels heavy.

Seizures can strike out of the blue. The body stiffens, jerks, or you blank out for a few seconds and pick up mid-sentence.

Speech slips. Words come out jumbled, names vanish, or you understand others but cannot answer back.

Thinking and mood shift. You forget short errands, lose track of money, or feel flat and uninterested in hobbies you once loved.

Balance wavers. Walking turns clumsy, like leaning on a moving bus, and quick head turns make the room spin.

Personality changes. A calm adult snaps at small things, laughs at sad news, or makes risky choices they never would before.