The inability to sense pain while remaining conscious
Analgesia is the inability to sense pain even while still conscious. There are many forms of analgesia. One is the so-called epidural analgesia, which is a form of analgesia that is induced by the introduction of an analgesic into the vertebral canal. A continuous epidural analgesia is done particularly during a general surgery or during childbirth. An anesthesia is injected continuously into the sacral and lumbar plexus within the epidural space so as to relieve pain. Another form of analgesia is the administration of an analgesic often by inhalation of nitrous oxide and oxygen to maintain a level of conscious sedation and is referred to as relative analgesia in dental anesthesia.1
Analgesia may be achieved by administering analgesic or painkiller. Analgesic drugs such paracetamol, salicylates, and opioids, act on the peripheral and central nervous system to relieve an individual from pain. Analgesia may also be achieved by the introduction of anesthetic drugs in order to facilitate surgery and other medical procedures that would normally cause pain. Analgesics are different from anesthetic drugs in a way that the latter relieves pain while eliminating sensation. The loss of sensation with anesthetics is temporary only.
1 analgesia. (n.d.) Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. (2003). Retrieved from ://medical-dictionary.thefreedictionary.com/analgesia