This page covers 43 first aid words that start with “B”, running from “Bandage” to “Broken Skin”. They span injuries, body processes, emergency techniques, and the equipment responders rely on. Together, they form the core vocabulary you need when someone is hurt and action is required.
First aid words are terms used to identify, describe, and respond to medical emergencies, injuries, and life-threatening situations. The phrase “first aid” became common in the late 1800s, when military doctors began training civilians to treat the wounded on and near the battlefield. Knowing these words helps you act quickly, communicate clearly, and follow instructions under pressure.
Below you’ll find the table with Word, Definition, and Description.
Word: The specific first aid term — each one names a condition, tool, technique, or body process you may encounter during an emergency.
Definition: A plain-language explanation of what the word means, giving you its core medical sense without heavy technical jargon.
Description: A practical look at how the term applies in a real first aid setting, including key actions, warning signs, and why it matters to you as a responder.
First aid words
| Word | Definition |
|---|---|
| Bandage | A strip of cloth, gauze, or other material used to cover or wrap a wound or injured body part |
| Burn | Tissue damage caused by heat, chemicals, electricity, radiation, or friction |
| Bleeding | Loss of blood from the circulatory system due to damage to blood vessels |
| Blister | A fluid-filled bubble that forms under the skin in response to friction, heat, or chemical injury |
| Bone Fracture | A break or crack in a bone resulting from trauma, overuse, or underlying disease |
| Blood Pressure | The force exerted by circulating blood against the walls of the arteries |
| Breathing | The physiological process of inhaling oxygen and exhaling carbon dioxide |
| Bruise | Discoloration of the skin caused by blood leaking from damaged vessels beneath the surface |
| Basic Life Support | Foundational emergency care techniques including CPR, airway management, and rescue breathing |
| Bag Valve Mask | A hand-held resuscitation device used to deliver positive-pressure ventilation to a non-breathing patient |
| Blood Glucose | The concentration of sugar (glucose) circulating in the bloodstream |
| Bite | A wound caused by the teeth of a person, animal, or insect that breaks or damages the skin |
| Bradycardia | An abnormally slow heart rate, typically defined as below 60 beats per minute |
| Brain Injury | Damage to the brain resulting from trauma, lack of oxygen, stroke, or other causes |
| Brachial Pulse | The pulse point located in the brachial artery running along the inner upper arm |
| Bleeding Control | Techniques and tools used to stop or minimize blood loss from a wound |
| Bronchospasm | Sudden constriction of the smooth muscle surrounding the airways, narrowing the bronchioles |
| Blunt Trauma | An injury caused by a forceful impact that does not break through the skin |
| Bloodborne Pathogen | A microorganism present in human blood capable of causing disease if transmitted to another person |
| Body Temperature | The measurement of the body’s core internal heat, normally around 98.6°F (37°C) |
| Burns Classification | The system of categorizing burn injuries by the depth of tissue damage |
| Back Injury | Damage to the vertebrae, spinal cord, muscles, or ligaments of the back |
| Blood Clot | A gel-like coagulation of blood that forms to seal a damaged blood vessel |
| Bone Splint | A rigid or semi-rigid device applied to immobilize a fractured or dislocated bone |
| Body Position | The placement or posture of a patient used to optimize safety and first aid effectiveness |
| Blood Volume | The total amount of blood circulating within the body’s cardiovascular system |
| Breathing Rate | The number of breaths a person takes per minute, measured at rest |
| Bystander CPR | Cardiopulmonary resuscitation performed by a bystander or witness before professional emergency help arrives |
| Butterfly Closure | A narrow adhesive strip used to hold the edges of a small wound together while it heals |
| Brachial Artery | The major blood vessel that runs along the inner aspect of the upper arm supplying the forearm and hand |
| Blood Poisoning | A life-threatening condition (sepsis) in which a bacterial infection spreads into the bloodstream |
| Broken Bone | A colloquial term for a fracture — any crack or complete break in a bone |
| Boil | A painful, pus-filled skin abscess caused by a bacterial infection of a hair follicle |
| Breath Sounds | Noises produced by air moving through the airways and lungs, assessed by listening or auscultation |
| Blood Thinners | Medications (anticoagulants) that reduce the blood’s ability to form clots |
| Bite Wound | A specific wound inflicted by teeth that punctures, lacerates, or crushes skin and underlying tissue |
| Breathing Difficulty | Any condition in which a person experiences distress or abnormality in the process of respiration |
| Blood Loss | The reduction of circulating blood volume due to internal or external hemorrhage |
| Body Fluid Exposure | Contact with blood, saliva, urine, or other biological fluids that may carry infectious agents |
| Burn Dressing | A specialized wound covering designed to protect burned skin and promote healing |
| Bleed-out | Rapid and severe blood loss that quickly becomes life-threatening without immediate intervention |
| Blood Supply | The flow of oxygenated blood delivered to a tissue or organ through the circulatory system |
| Broken Skin | Any disruption to the skin’s surface that removes its protective barrier against infection |
Descriptions
Bandage
Bandages protect wounds from contamination, apply pressure to stop bleeding, and support injured limbs; they come in many forms including roller bandages and triangular bandages.
Burn
Burns are classified by depth — first, second, or third degree — and treatment ranges from cool running water for minor burns to emergency medical care for severe cases.
Bleeding
Controlling bleeding is a primary first aid priority; direct pressure applied with a clean cloth is the standard first response for external hemorrhage.
Blister
Blisters should generally not be popped, as the fluid cushions and protects healing tissue; cover with a loose bandage to reduce irritation.
Bone Fracture
Suspected fractures should be immobilized with a splint in the position found, and the patient transported for medical imaging and professional treatment.
Blood Pressure
Monitoring blood pressure helps assess cardiovascular status; abnormally low pressure can signal shock, a life-threatening emergency requiring urgent care.
Breathing
Checking whether a person is breathing is a critical first step in emergency assessment; absent breathing requires immediate CPR or rescue breaths.
Bruise
Bruises result from blunt trauma; applying ice wrapped in cloth and elevating the area can reduce swelling and minimize discoloration.
Basic Life Support
BLS is the essential first response to cardiac arrest and respiratory failure, maintaining circulation until advanced medical care arrives.
Bag Valve Mask
Often called a BVM or Ambu bag, this device allows rescuers to provide rescue breaths without direct mouth-to-mouth contact, using a tight face seal.
Blood Glucose
Low blood glucose (hypoglycemia) can cause unconsciousness; first aid includes giving sugar to a conscious patient who is able to swallow safely.
Bite
Bites carry a high infection risk; first aid involves cleaning thoroughly with soap and water, covering with a bandage, and seeking medical evaluation promptly.
Bradycardia
Severe bradycardia can cause dizziness, fainting, or cardiac arrest; if the patient is unresponsive, emergency services should be called immediately.
Brain Injury
Signs of traumatic brain injury include confusion, vomiting, and unequal pupils; always immobilize the spine and call emergency services when brain injury is suspected.
Brachial Pulse
The brachial pulse is used to check circulation in infants during CPR and to assess blood flow to the forearm and hand after injury.
Bleeding Control
Effective methods include direct pressure, wound packing with gauze, elevation, and tourniquet application for life-threatening extremity hemorrhage.
Bronchospasm
Bronchospasm causes wheezing and breathing difficulty and is common in asthma attacks; treatment may include a rescue inhaler or, in severe cases, epinephrine.
Blunt Trauma
Blunt trauma can cause internal bleeding, organ damage, or fractures without visible external wounds; internal injuries must always be suspected and monitored.
Bloodborne Pathogen
HIV, Hepatitis B, and Hepatitis C are common bloodborne pathogens; first aiders must wear gloves when exposed to blood to prevent transmission.
Body Temperature
Fever, hypothermia, and hyperthermia all represent dangerous deviations from normal temperature and each requires specific first aid monitoring and response.
Burns Classification
Burns are classed as first-degree (superficial redness), second-degree (blistering), or third-degree (full-thickness destruction), with each requiring a different level of care.
Back Injury
Suspected spinal injuries require the patient to be kept completely still; moving a person incorrectly after a back injury can cause permanent paralysis.
Blood Clot
While clotting is a vital response to injury, dangerous internal clots (thrombosis) can block blood flow and lead to heart attack, stroke, or pulmonary embolism.
Bone Splint
Splinting keeps a fracture site stable, reducing pain and preventing further injury during transport; improvised splints can be made from boards, rolled magazines, or clothing.
Body Position
Correct positioning — such as the recovery position for unconscious individuals — prevents airway obstruction and reduces the risk of aspiration.
Blood Volume
An average adult has approximately 5 liters of blood; losing more than 20% can lead to hypovolemic shock, requiring urgent medical intervention.
Breathing Rate
Normal adult breathing rate is 12–20 breaths per minute; rates significantly outside this range indicate respiratory distress and require assessment or intervention.
Bystander CPR
Immediate bystander CPR significantly increases survival rates from cardiac arrest; compression-only CPR is recommended for untrained bystanders when rescue breathing is not possible.
Butterfly Closure
Butterfly closures (or steri-strips) approximate wound edges to reduce scarring; they are suitable for small clean cuts but not for deep, jagged, or heavily bleeding wounds.
Brachial Artery
Applying pressure over the brachial artery can help control severe bleeding from the forearm or hand; its pulse is also a key assessment point in infants.
Blood Poisoning
Signs include high fever, rapid heart rate, confusion, and pale or mottled skin; blood poisoning requires emergency hospital treatment, not home first aid alone.
Broken Bone
All suspected broken bones should be splinted in the position found without attempting to straighten; the patient should receive professional imaging and treatment.
Boil
Boils are managed with warm compresses to encourage natural drainage; squeezing or lancing a boil without medical guidance can spread infection to surrounding tissue.
Breath Sounds
Abnormal breath sounds — such as wheezing, gurgling, or absence of sound — can indicate asthma, airway obstruction, or fluid in the lungs, guiding urgent first aid decisions.
Blood Thinners
Patients on blood thinners bleed more severely and for longer; first aiders should apply firm, sustained pressure and alert emergency responders to the medication use.
Bite Wound
Bite wounds carry a high risk of infection including tetanus and rabies; thorough irrigation, antibiotic evaluation, and medical assessment are always recommended.
Breathing Difficulty
Causes range from asthma and allergic reactions to chest injuries; first aid focuses on positioning the patient upright, keeping them calm, and calling for help.
Blood Loss
Significant blood loss causes weakness, pallor, rapid pulse, and eventually shock; controlling hemorrhage with direct pressure or a tourniquet is the immediate first aid priority.
Body Fluid Exposure
First aiders should wear gloves and eye protection to minimize exposure risk; if exposure occurs, the affected area should be washed immediately with soap and water.
Burn Dressing
Burn dressings are non-adherent to prevent damage on removal; they may contain antimicrobial agents and should be applied after cooling the burn with running water.
Bleed-out
Bleed-out from major arteries can cause death in minutes; tourniquet application and wound packing are the primary first aid interventions for catastrophic hemorrhage.
Blood Supply
Checking blood supply distal to an injury — by assessing color, temperature, pulse, and sensation — confirms whether circulation has been compromised.
Broken Skin
Broken skin from cuts, scrapes, or punctures must be cleaned, covered, and monitored for signs of infection such as redness, swelling, warmth, and discharge.