Abnormal hot and cold sensations and burning sensations in the left leg may be caused by calcium deficiency, dermal neuritis, nerve compression and other reasons. 1. Calcium deficiency: when calcium loss increases or calcium intake is insufficient, it can cause calcium deficiency, leading to increased neuromuscular excitability, which can lead to leg cramps and abnormal hot and cold sensations. 2. Dermal neuritis: Dermal neuritis in the legs can be caused by damage or inflammation of nerves or nerve groups in the legs, and the main symptom is abnormal sensation, which may be pinprick, burning or ants crawling sensation. 3. Nerve compression: If you suffer from lumbar disc herniation, lumbar spondylolisthesis, pyriformis syndrome and other diseases, due to the compression of the nerve root and sciatic nerve, it can cause pain and numbness in the lower limbs of the side of the compression, and it can also cause abnormal hot and cold sensations in the legs and the phenomenon of burning sensation. Abnormal hot and cold sensation and burning sensation in the left leg may be caused by other reasons, it is recommended that the patient go to the hospital in time, under the guidance of the doctor for standardized treatment.