Shock (Circulatory Shock): Signs, Types and First Aid

What to do right now: first aid for shock

1. Call 911 or your local emergency number.
2. Treat the obvious cause: - Bleeding: press firmly on the wound with a cloth. Use a tourniquet for life-threatening limb bleeding if trained. - Anaphylaxis: use the person's epinephrine auto-injector in the outer thigh. A second dose may be given after 5 to 15 minutes if there is no improvement.
3. Lay the person flat on their back. If there is no head, neck, spine or leg injury, raising the legs about 30 cm (12 inches) may help. Let a person who is struggling to breathe sit up.
4. Keep them warm with a coat or blanket, and loosen tight clothing.
5. Do not give food or drink, even if thirsty, as they may need surgery or may vomit.
6. Check breathing and responsiveness. If they stop breathing normally, start CPR and use an AED if available.
7. Stay with them and reassure them until help arrives.

What is shock?

Every organ needs a steady supply of oxygen. Blood flow depends on three things: enough blood volume, a heart that pumps effectively and blood vessels with the right tone. When any of these fails badly, tissues are starved of oxygen. Cells switch to an inefficient backup metabolism that produces lactic acid, and organs such as the kidneys, brain, liver and heart begin to fail.

Medical shock is different from emotional shock (the dazed reaction after bad news or trauma), which is a psychological acute stress reaction and not a circulatory failure.

Types of shock

More than one type can occur together, for example sepsis with dehydration.

Signs and symptoms of shock

• Fast, weak or thready pulse (rapid heart rate)
• Low blood pressure, often a systolic pressure under 90 mmHg, although young people can keep normal pressure until late
• Pale, gray, cold and clammy skin, or mottled skin on the knees; early septic shock can feel warm
• Slow capillary refill: after pressing on a fingernail, color takes more than 2 to 3 seconds to return
• Fast, shallow breathing
• Anxiety, restlessness, confusion or drowsiness
• Dizziness or fainting, especially on sitting or standing
• Thirst, nausea
• Little or no urine

Shock in children and older adults

Children compensate well and may have normal blood pressure until they suddenly collapse. A fast heart rate, cold hands and feet, drowsiness and fewer wet diapers are early clues. Older adults and people on beta-blockers may not develop a fast pulse, and confusion may be the main sign.

Stages of shock

1. Compensated: the body tightens blood vessels and raises heart rate to keep blood pressure normal. Signs are subtle: fast pulse, cool skin, anxiety.
2. Decompensated (progressive): compensation fails. Blood pressure falls, confusion worsens and urine output drops.
3. Irreversible: prolonged oxygen starvation damages organs beyond recovery, and multiple organ failure follows.

Treatment in the first stage has the best outcomes, which is why early signs matter.

How doctors diagnose and treat shock

In the emergency department, assessment and treatment happen at the same time.

Tests include blood pressure and heart monitoring, oxygen levels, blood lactate (a marker of oxygen starvation), blood counts, kidney and liver tests, blood cultures, an ECG, chest X-ray and bedside ultrasound of the heart, lungs and belly to find the type and cause quickly.

Treatment:

• Oxygen and, if needed, a breathing tube and ventilator
• IV fluids for hypovolemic and septic shock; blood transfusion for bleeding
• Vasopressors (medicines such as norepinephrine) to raise blood pressure
• Treating the cause: surgery or procedures to stop bleeding, antibiotics within the first hour for septic shock, epinephrine for anaphylaxis, reopening blocked heart arteries, clot-busting drugs for massive pulmonary embolism, or draining air or fluid around the lungs or heart
• Intensive care monitoring of organ function

Outlook

The outlook depends on the cause and how fast treatment starts. Anaphylaxis treated promptly usually resolves completely. Hemorrhagic shock does well if bleeding is controlled quickly. Septic and cardiogenic shock remain serious, with significant mortality even with modern intensive care. Survivors may need rehabilitation for weakness, kidney problems or memory and mood changes after an ICU stay.

Frequently asked questions

What are the first signs of shock?

Early signs include a fast pulse, fast breathing, pale or cool and clammy skin, anxiety or restlessness, thirst and dizziness when sitting up. Blood pressure may still be normal at first, especially in young people. Falling blood pressure, confusion and very little urine are later and more serious signs.

What are the 4 main types of shock?

The four main types are hypovolemic shock from blood or fluid loss, cardiogenic shock from a failing heart, distributive shock from widened leaky blood vessels in sepsis, anaphylaxis or spinal injury, and obstructive shock from a physical blockage such as a large lung clot, collapsed lung or fluid around the heart.

What is the first aid for shock?

Call 911 or your local emergency number. Stop any bleeding with firm pressure, use an epinephrine auto-injector for anaphylaxis, lay the person flat and raise their legs if there is no injury, keep them warm, and give nothing to eat or drink. Start CPR if they stop breathing normally.

Is emotional shock the same as medical shock?

No. Emotional shock is the dazed, numb or distressed reaction after a traumatic event or bad news. It is a psychological response. Medical shock is a physical failure of circulation that starves organs of oxygen and can be fatal without emergency treatment. Fainting after bad news is usually a brief, harmless reflex.

Can you survive shock?

Yes, many people do, especially when treatment starts early. Survival depends on the cause and speed of care. Anaphylaxis and bleeding treated quickly often have good outcomes, while septic and cardiogenic shock carry higher risk. Recognizing the signs and calling for help immediately makes the biggest difference.