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Anaesthesia is a state of controlled, temporary loss of sensation or awareness. Anaesthesia is used for medical purposes and it includes analgesia, muscle relaxation, loss of memory or unconsciousness.

Types of anaesthesia include
- General anaesthesia
- Regional anaesthesia
- Local anaesthesia
- Monitored sedation

The risks associated with anaesthesia depend upon the health of the patient, complexity of the procedure and anaesthetic technique. These risks include postoperative nausea, vomiting, dizziness, confusion, memory loss, difficulty passing urine, pulmonary embolism, myocardial infarction, death, local anaesthetic toxicity, airway trauma and malignant hyperthermia.

Anaesthesia feels like loss of pain and awareness. There is temporary loss of sensation, muscle relaxation, loss of memory or unconsciousness. It depends upon whether it is general anaesthesia or regional/local anaesthesia.

Anaesthesia suppresses central nervous system and results in loss of sensation, pain and consciousness, muscle relaxation and finally leads to sleep. Anaesthetic agents exert their action by activation of inhibitory central nervous system receptors or inactivation of CNS excitatory receptors.