This study will include 60 elderly patients with cervical disc degeneration, from both gender who are aged from 60 - 75 years old.

The 60 patients will divided into two groups, with 30 patients in each group. group(A): will receive low level lazer and exercises for three times per week for 12 weeks.

Group (B): will receive only exercises. Resistivity index of both right and left vertebral arteries will be measured before and after the 12 weeks.

Inclusion Criteria:

1. elderly patients with age range between 60 and 75 years old.
2. with cervical disc degeneration.

Exclusion Criteria:

1. patients with uncontrolled hypertension.
2. Patients with uncontrolled diabetes mellitus.
3. Patients with severe cardiac or chest diseases.