| Muscle or soft-tissue strain | Pain after lifting, twisting, exercise, or unfamiliar work | Severity, movement tolerance, bruising, weakness, and appropriate loading |
| Joint irritation or stiffness | Localized pain with specific movements or prolonged positions | Movement pattern, mobility, strength, and response to repeated activity |
| Disc-related back pain | Pain influenced by sitting, bending, lifting, coughing, or leg symptoms | Neurological findings, directional response, function, and need for referral |
| Nerve involvement | Leg pain, numbness, tingling, burning, or weakness | Nerve distribution, strength, sensation, reflexes, and urgent findings |
| Reduced physical capacity | Pain returns with lifting, long standing, training, or work | Strength, endurance, movement confidence, and workload |
| Rapid training or workload increase | Symptoms after new gym routines, sports, running, or heavy work | Load history, recovery, technique, and tissue tolerance |
| Prolonged sitting and commuting | Stiffness or pain during office work, driving, or long travel | Position tolerance, breaks, workstation, hips, trunk endurance, and activity level |
| Inflammatory or medical condition | Night pain, prolonged morning stiffness, fever, illness, or symptoms outside a mechanical pattern | Red flags and need for medical referral |