Hidden numbness on the outside of the right calf may be caused by poor blood circulation in the nerve endings, drugs or chemicals, lumbar disc herniation, craniocerebral disease and other reasons for numbness. 1. Poor blood circulation of nerve endings: pregnancy, incorrect sleeping position, too long a time in the toilet can trigger poor blood circulation of nerve endings, resulting in vague numbness of the outer side of the right calf. 2. Drugs or chemical agents: upper respiratory tract infection or diarrhea, after taking berberine hydrochloride or furazolidone, or in the environment containing hydrogen, arsenic, carbon disulfide and so on for a long time, there will be a vague numbness of the outer side of the right calf. 3. Lumbar disc herniation: because the lumbar disc herniation will compress the nerve root, the nerve root pressure will lead to local blood circulation obstacles, prompting the swelling of the nerve root, which triggered the right calf lateral hidden numbness. 4. Craniocerebral disease: local brain tissue due to lesions, so that the corresponding limbs produce numbness and movement disorders, can also lead to the right calf lateral numbness. If there is a pathology of the right calf lateral numbness, it is recommended that we consult a doctor in time to make the appropriate treatment plan.