Lumbar muscle strain is a chronic condition, not an acute onset. It is caused by fatigue, overexertion, trauma, and vigorous exercise, leading to prolonged and repeated strain, pulling, rupture, and damage of the lumbar muscles, resulting in scar formation and lumbar muscle strain. Therefore, this disease is essentially a chronic ailment, and its healing mainly relies on rest to promote recovery. If muscle damage occurs in the lumbar region and one does not rest, continuing to work and bear loads as usual, the muscles will not heal and will eventually become scarred. Thus, the duration for the healing of lumbar muscle strain depends not on the number of days, but whether adequate and proper rest has been taken. Additionally, applying medications that invigorate blood circulation and disperse blood stasis can assist in recovery. Generally, if care is taken to rest adequately, avoid carrying heavy loads, prevent fatigue, and avoid vigorous exercise, while also using oral medications or plasters that invigorate blood and dispel stasis, healing can gradually occur. However, the condition may recur under fatigue and strain in the future, as it is a chronic disease and complete healing is very difficult to achieve. (Note: This answer is for reference only. Medication should be administered under the guidance of a professional physician, and medications should not be used blindly.)