Back pain near the spine that appears after standing for a long time is commonly related to muscle strain, poor posture, weak back muscles, long hours of standing, or sometimes stiffness in the spine. It is often mechanical pain, meaning it gets worse with posture or activity and improves with rest. In many people, lack of stretching, excess weight, or sleeping on an unsuitable mattress can also add strain to the lower back muscles and spine. Instead of focusing only on medicine, improving posture and reducing strain usually helps more in the long run. Taking short breaks while standing, avoiding bending for long periods, and doing gentle back stretching exercises can reduce pressure on the spine. A hot compress or warm bath may help relax tight muscles and reduce discomfort. Medicines/treatment should be taken only if advised or prescribed by your doctor. If the pain starts spreading to the legs, causes numbness, weakness, difficulty walking, or becomes severe even at rest, it is important to get examined to rule out disc or nerve-related problems. Persistent back pain lasting several weeks also needs proper medical evaluation.