Final answer:
Headaches and seizures are the two most common presenting symptoms of brain tumors in adults, with other symptoms varying based on the tumor's location.
Step-by-step explanation:
The two most common presenting symptoms of brain tumors in adults are headaches and seizures. Other symptoms depend on the tumor’s location in the brain and may include difficulty with balance, speech, and sensory processing. Tumors can cause pressure inside the skull that leads to a variety of neurological symptoms, potentially even permanent brain damage if not treated swiftly and effectively.