Anesthesia works as a painkiller where the medication can block the pain sensation for certain duration depending upon the dosage of medicine and patient’s condition. It is needed where the invasive surgeries and damaged parts have to be removed or a highly sensitive area needs treatment. There are mainly three types of anesthesia which can be delivered, 

1. Local Anesthesia: Local Anesthesia is very mild and can be delivered to specific parts of the body but the patient will be fully alert and awake. 
2. Regional Anesthesia: This type can be given to a specific part of the body undergoing the surgery. The anesthetic part will not feel any pain however the patient may or may not be alert to witness the surgery. 
3. General Anesthesia: This type will make you sleep and work on your whole body. Once the anesthesia is delivered the patient does not feel any pain and does not have any memory regarding the same. This can only be given where the surgical operations are involved such as transplant or open heart surgeries and more.