When sitting on the toilet, the human hip joint is in a flexed state, which will impede the flow of blood in the arteries and veins and affect the nerve conduction function, which will result in reduced sensory function of the lower limbs over time, and the increase in abdominal pressure during forceful defecation will aggravate the symptoms of leg numbness. No special treatment is usually required. When you stand up, the blood supply is restored and the nerves are released from compression, the numbness in the legs will resolve on its own.
For health reasons, it is advisable not to sit on the toilet for long periods of time, less than 10 minutes.