Unsaturated pyrrolizidine alkaloids are hepatotoxic, that is, damaging to the liver. PAs also cause hepatic veno-occlusive disease and liver cancer. PAs are tumorigenic. Disease associated with consumption of PAs is known as pyrrolizidine alkaloidosis.
The venom is what causes the symptoms. The main symptoms are pain, itching, swelling and redness at the sting site. Severe pain or burning at the site lasts 1 to 2 hours. Itching often follows the pain. Swelling. The bee sting may swell for 48 hours after the sting. The swelling can be small or large.
The extent of the swelling depends upon the site of the bee sting. Some body parts tend to swell more than the others. For instance, you will notice a considerable swelling, if the bee stung you on face, as opposed to hands or legs. You can reduce the swelling from bee sting by immediately applying a pack of ice.