3. Blood Disorders. Blood disorders such as hemophilia and leukemia can cause unexplained bruising, often because your blood fails to clot properly. If you have severe and frequent unexplained bruising, it's a good idea to see a physician to rule out such disorders, especially if it seemed to come on suddenly.
Puffer fish contain the potent neurotoxin tetrodotoxin. TTX is thought to be synthesized by a bacterial or dinoflagellate species associated with the puffer fish. The toxin is concentrated in the liver, gonads, and skin. The level of toxicity is seasonal, and, in Japan, fugu is served only from October through March.
Are there any plant toxins that cause similar neurological symptoms to tetrodotoxin or chlorotoxin? Biochemically, why might these be similar? What are some of the ways in which humans have exploited poisons such as tetrodotoxin and snake venoms in the past? Further reading. Venoms and the blood; About this resource