Muscle strain, cold and herniated disc may cause thigh muscle pain after rice-planting, you should go to the hospital for examination in time and choose physical therapy or medication according to the cause. 1. Muscle strain: sudden exertion of thighs or continuous muscle tension during rice planting may lead to thigh muscle strain, causing thigh muscle pain, it is recommended to stop exercise, apply local ice pack to reduce congestion, and after 72 hours of applying ice pack, you can apply local massage or hot compress to relieve pain. 2. Cold: standing in the water for a long time when transplanting rice seedlings may lead to cold legs, which may cause muscle spasm and thigh muscle pain, local warmth can be enhanced to relieve pain. 3. Herniated lumbar discs: long-time bending while transplanting rice seedlings may compress the nerve roots, causing pain and numbness in the thigh muscles, which can be relieved by bed rest or taking non-steroidal anti-inflammatory drugs such as ibuprofen under the guidance of a doctor. Femoral head or knee joint lesions and other reasons may also cause thigh pain, thigh muscle pain after rice-planting should promptly consult a doctor to identify the cause, give targeted treatment, do not self-medication.