The term âdementiaâ is used to describe a set of symptoms that can include memory loss, difficulty thinking, problem solving, or issues with language. Dementia is caused by damage to the brain cells, and because Alzheimer's is a disease that destroys the brain, it is one of the most common causes of dementia.
Most spider bites cause minor swelling, inflammation, and itching. However, bites from poisonous spiders can cause more severe reactions. Black widow bites affect the nervous system. The bite from a black widow may go unnoticed or may feel like a pinprick.
Toxins which attack the tissue. Necrotic venoms cause skin blisters around the site of the bite, which may lead to ulcers and tissue death - necrosis. Recent studies of confirmed spider bites suggest that, in Australia, these bites do not cause tissue necrosis. These sorts of symptoms are most likely due to other types of clinical conditions.