Neck, lower back, and shoulder stiffness is commonly due to muscle strain, poor posture, or long sitting hours rather than issues with your normal BP and blood sugar. Do regular gentle stretching, maintain proper sitting posture, use a supportive chair, and take breaks every 30-40 minutes if you work long hours on a computer. Applying a warm compress and doing light exercises like neck stretching exercises and shoulder rolls can help relieve stiffness; you may also use mild pain relief like paracetamol if needed. If pain persists, worsens, or causes numbness or tingling, consult a doctor for further evaluation.