Soreness in the front of the thighs may be caused by over-exercise, local inflammation, lumbar spine disease and so on. 1. Excessive exercise: when the patient walks for a long time or after strenuous exercise, it may lead to the accumulation of lactic acid in the thigh muscles, thus causing the front of the thigh soreness and pain. In addition, muscle strains caused by strenuous exercise may also trigger such symptoms. 2. Localized inflammation: When patients have localized inflammation such as fasciitis in the thigh area, it may lead to symptoms such as soreness and pain in the front of the thigh. 3. Lumbar spine diseases: common lumbar spine diseases include herniated intervertebral discs, lumbar spinal stenosis, etc. Such lumbar spine problems may compress the nerves in the thighs and cause soreness and pain in the front of the thighs. It is recommended that patients seek timely medical examination, clear condition after targeted treatment, pay attention to rest in life, avoid strenuous exercise, and at the same time do a good job of monitoring the condition, if there is any abnormality in a timely manner to consult a doctor.