Lumbar muscle strain often occurs when engaging in heavy physical labor. For instance, swinging a heavy hammer or bending over for strenuous tasks, as is common for carpenters and roofers. Such occupations involve considerable effort from the lumbar region with frequent movements, and prolonged work can easily lead to local muscle congestion and exudation, stimulating surrounding nerves and blood vessels leading to strain. Generally, after finishing such activities, one may experience lumbar discomfort and stiffness the next morning, where the lumbar region feels stiff like a board, making movement painful. Movement can alleviate the pain somewhat, which is a typical symptom. Lumbar muscle strain usually requires strict bed rest, ideally for about a week, and it is best to take a leave of absence for about seven to ten days. Treatment often involves medications that promote blood circulation and relieve pain, combined with heat application, massage, and physical therapy, all of which can help alleviate symptoms. If it is possible and the workplace allows, it is recommended to rest for about seven to ten days.