Castor seed is the seed of castor plant of Euphorbiaceae family, castor seed is very toxic. Ricin contains ricin toxic protein can cause poisoning, castor seed poisoning symptoms are: anuria, jaundice, cold sweat, headache, gastroenteritis, cramps, defecation, poisoning symptoms followed by an attack will have a long incubation period. Ricin causes acute poisoning in rats, producing mainly liver and kidney injuries and disturbances in carbon and water metabolism. Castor seed kernel contains a large amount of natural oil, the gastrointestinal tract has a significant lubricating effect, treated castor seed kernel used in medicine can be laxative; can also reduce swelling and pull out the poison, is the treatment of gangrene sores, scrofula (mainly refers to the cervical lymph nodes tuberculosis), laryngeal paralysis (pharyngeal redness, swelling and pain, or dryness, a sense of foreign bodies, or pharyngeal itching discomfort and difficulty in swallowing) one of the commonly used components of the drug. Attention should be paid to the symptoms of accidental ingestion of untreated castor beans, should be promptly to the hospital for consultation and treatment.