The left hand neuralgia may be caused by too much hand activity. It is also possible that the left hand neuralgia may be a precursor to cardiovascular disease, so patients must pay attention to exclude the existence of cardiovascular disease. 4, left hand neuralgia may also be caused by insufficient blood supply to the cerebral vessels, you can eat some red dates, if necessary, you can consult a doctor, eat drugs to supplement the qi and blood, so as to relieve the symptoms of left hand neuralgia. The left hand neuralgia may also be caused by insufficient blood supply to the brain.