By ingesting saxitoxin, humans can suffer from numbness, ataxia, incoherence, and in extreme cases respiratory paralysis and death.
en.wikipedia.org Overdose can lead to headache, tinnitus, numbness and tingling around the mouth and tongue, convulsions, inability to breathe, and decreased heart function.
en.wikipedia.org Its symptoms include pain, weakness, numbness, and stiffness in the back, shoulders, arms or legs.
en.wikipedia.org When they return to the patient, the numbness in her arms is gone, but they are covered in bruises.
en.wikipedia.org Over time, however, the numbness brought on by alcohol becomes his main desire.
en.wikipedia.org