What does "increased reflexes throughout" mean?

My dad has health problems and he's really private about it and I found a paper that the doctor wrote that said "patient has increased reflexes throughout and increased tone in lower limbs".  I know he has a test coming up, but not sure what exactly this diagnosis means?? anyone know if it's serious or not?

[Dr Sharma]

Hi there. Hyperreflexia means overresposive reflexes which could include twitching, suggest upper motor neuron disease, hypernatremia, stroke, brain tumor, spinal cord injury, etc. causes of increased tone of lower limbs are cervical spinal cord injury or tumor, cervical spondylosis, multiple sclerosis, upper motor neuron disorder. Confide in your dad and help him by being around for his neurologist’s office visit. You are very welcome with any further posts on this forum. Take care.

[reese_zmc]

Thanks so much for explaining!