Injuries and Poisoning - Merck Manuals Consumer Version

Abdominal Injuries

The abdomen can be injured in many ways. The abdomen alone may be injured or injuries elsewhere in the body may also occur. Injuries can be relatively mild or very severe.
Altitude Illness

Altitude illness occurs because of a lack of oxygen at high altitudes.
- Altitude Illness
Bites and Stings

Many creatures, including humans, bite when frightened or provoked. Others include
Burns

Burns are injuries to tissue that result from heat, electricity, radiation, or chemicals.
Chest Injuries

Chest injuries most often affect the ribs, upper part of the abdomen, lungs, blood vessels, heart, muscles, soft tissues, and breastbone. Sometimes the esophagus, collarbone, or shoulder blade is also injured.
Cold Injuries

The skin and the tissues under it are kept at a constant temperature (about 98.6° F, or 37° C) by the circulating blood and other mechanisms. The blood gets its heat mainly from the energy given off by cells when they burn (metabolize) food—a process that requires a steady supply of food and oxygen. A normal body temperature is necessary for proper functioning of all the cells and tissues in the body. In a person with low body temperature, most organs, especially the heart and brain, become sluggish and eventually stop working.
Dislocations

A dislocation is complete separation of the bones that form a joint. In subluxation, the bones in a joint are partly out of position. Often, a dislocated joint remains dislocated until it is put back in place (reduced) by a doctor, but sometimes it moves back in place on its own.
Diving and Compressed Air Injuries

People who engage in deep-sea or scuba diving are at risk of a number of injuries, most of which are caused by changes in pressure. These disorders also can affect people who work in underwater tunnels or caissons (watertight enclosures used for construction work). Such structures contain air under high pressure to keep out water.
Drowning

Drowning occurs when submersion in liquid causes suffocation or interferes with breathing.
- Drowning
Electrical and Lightning Injuries

An electrical injury occurs when a current passes through the body, interfering with the function of an internal organ or sometimes burning tissue.
- Electrical Injuries
- Lightning Injuries
Eye Injuries

The structure of the face and eyes is well suited for protecting the eyes from injury. The eyeball is set into the orbit, a socket surrounded by a strong, bony ridge. The eyelids close quickly to form a barrier to foreign objects, and the eye can at times tolerate minor impact without damage.
Facial Injuries

A number of different injuries can affect the outer ear.
First Aid

The goal of first aid is to save life, to prevent an injury or illness from worsening, or to help speed recovery. First aid for choking, internal bleeding, minor wounds, and minor soft tissue injuries is discussed in this chapter. Other chapters discuss first aid for the following:
Fractures

A fracture is a crack or break in a bone. Most fractures result from force applied to a bone.
Head Injuries

Head injuries that involve the brain are particularly concerning.
Heat Disorders

Humans, who are warm-blooded animals, maintain their body temperature within 1 or 2 degrees of 98.6° F (37° C) as measured by mouth and 100.4° F (38° C) as measured rectally, despite large fluctuations in external temperatures. This internal temperature range must be maintained for the body to function normally. Body temperature that gets too high or too low can result in serious injury to organs or death.
Injury to the Urinary Tract and Genitals

The kidneys and the rest of the urinary tract (the bladder, ureters [tubes that carry urine from the kidneys to the bladder], and urethra [the tube through which urine flows out of the body]) may become injured in a number of ways. Examples include injuries due to a blunt force (most commonly motor vehicle crashes, falls, or sports injuries) or a penetrating force (most commonly gunshot or stab wounds), or surgery. Injuries to the urinary tract often occur together with injuries to other organs, especially abdominal organs. In men, the penis and testes may also be injured.
Mass-Casualty Weapons

Mass-casualty weapons are weapons that can produce a mass-casualty incident. Mass-casualty incidents overwhelm available medical resources because they involve so many injured people (casualties). Mass-casualty weapons include a variety of
Motion Sickness

Motion sickness (also known as car, sea, train, or air sickness) involves a group of symptoms, particularly nausea, caused by movement during travel.
- Motion Sickness
Poisoning

Poisoning is the harmful effect that occurs when a toxic substance is swallowed, is inhaled, or comes in contact with the skin, eyes, or mucous membranes, such as those of the mouth or nose.
Radiation Injury

Radiation injury is damage to tissues caused by exposure to ionizing radiation.
- Radiation Injury
Spinal Injuries

A spinal cord injury is damage to the bundle of cells and nerves that carry incoming and outgoing messages between the brain and the rest of the body.
- Injuries of the Spinal Cord and Vertebrae
- Spinal Cord Injury in Children
  - Causes
  - Symptoms
  - Diagnosis
  - Treatment
Sports Injuries

Sports injuries are common among athletes and other people who participate in sports. Certain injuries that are traditionally considered sports injuries can also occur in people who do not participate in sports. For example, homemakers and factory workers often develop tennis elbow, although they may never have played tennis.
Sprains and Other Soft-Tissue Injuries

Sprains are tears in ligaments (tissues that connect one bone to another). Other soft-tissue injuries include tears in muscles (strains) and tears (ruptures) in tendons (tissues that connect muscles to bones).