Final answer:
Morning stiffness that improves with activity is a common symptom of low back pain in males aged 25-35, possibly indicating an inflammatory back condition. Diarrhea and uveitis are symptoms that can be related to other systemic health issues.
Step-by-step explanation:
The common symptoms of a male aged 25-35 with low back pain can include morning stiffness that improves with activity. This symptom may suggest a condition such as ankylosing spondylitis or other inflammatory back diseases. The other options such as diarrhea, uveitis, or a combination of all mentioned symptoms describe a broader spectrum of conditions that may not be directly related to low back pain or may be indicative of different systemic issues.