The symptoms of numbness in the left leg in women are caused as follows: 1. If the injury to the popliteal muscle leads to compression of the tibial nerve, numbness in the posterior aspect of the left calf will occur. 2. A herniated L4-5 intervertebral disc compressing the nerve root of L5 will cause numbness in the left lower extremity, lateral hip, lateral thigh, and lateral calf. 3. A jammed nerve in the gluteus medius muscle will cause pressure radiating points in the basic consistent course of the L5 nerve. 4. Peroneal nerve injury can also present with lateral calf numbness, for example, anterolateral femoral cutaneous nerve entrapment can lead to numbness in the anterolateral thigh. 5. If left-sided piriformis syndrome entraps the left sciatic nerve, it can lead to symptoms of numbness in the posterior hip, posterior thigh, posterior and lateral calf. 6. L5-S1 disc herniation compresses the nerve root of S1 and can present with symptoms of posterior hip, posterior thigh, and numbness symptoms on the posterior side of the calf. Therefore, for women, if symptoms of numbness in the left leg occur, they must first rest in bed, avoid strenuous activities, avoid straining, avoid prolonged sitting and standing, and then after resting in bed, give appropriate physical therapy and oral medication. If there is no relief within a short period of time, you must go to a regular hospital in a timely manner to improve the necessary relevant examinations and choose a reasonable treatment method after clarifying the cause.