The basics of First Aid in any situation are ABC: Airway Breathing Circulation. First Aid is an Aid to medical help not the end of activity. It is no substitute to Medical help or the end of treatment. Aims of First Aid are to preserve life, prevent further injury, and promote recovery. The other most important thing is to protect you. Cardiopulmonary resuscitation (CPR) procedures carry a risk of further injury to the patient - which the ?3 aims? of first aid above, clearly try to avoid. CPR involves breathing for the patient, and manually massaging the heart to promote blood flow around the body. Things to be looked into are Breathing, Bleeding, and Bones. Most important training a first aider can receive is in the primary diagnosis and care of an unconscious or unresponsive patient. In order to preserve life, all persons require an open airway - a clear passage where air can move in through the mouth or nose and through the pharynx and down in to the lungs, without obstruction. If an unconscious patient is lying on his/her back, the tongue may fall backward, obstructing the oropharynx (sometimes incorrectly called ?swallowing? the tongue). This can be easily rectified by a first aider tipping the head backwards, which mechanically lifts the tongue clear. To check for the pulse the First aider needs to turn the patients head to the left (mandatory position in unconscious patients), then feel for the pulse in between the midline and the projecting muscle. It can be felt with three fingers; do not try to feel the pulse on both the sides simultaneously. The person attempting to provide first aid to someone will need to be trained in that. There are some common conditions that need first aid like Anaphylaxis (Generalised allergic reaction), Bone fracture, Burns, Choking, Cramps, Heart Attack, Heat Stroke, Heavy Bleeding, Fits, Sprain.